/******/
(function(modules) { // webpackBootstrap
    /******/ // The module cache
    /******/
    var installedModules = {};
    /******/
    /******/ // The require function
    /******/
    function __webpack_require__(moduleId) {
        /******/
        /******/ // Check if module is in cache
        /******/
        if (installedModules[moduleId]) {
            /******/
            return installedModules[moduleId].exports;
            /******/
        }
        /******/ // Create a new module (and put it into the cache)
        /******/
        var module = installedModules[moduleId] = {
            /******/
            i: moduleId,
            /******/
            l: false,
            /******/
            exports: {}
            /******/
        };
        /******/
        /******/ // Execute the module function
        /******/
        modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
        /******/
        /******/ // Flag the module as loaded
        /******/
        module.l = true;
        /******/
        /******/ // Return the exports of the module
        /******/
        return module.exports;
        /******/
    }
    /******/
    /******/
    /******/ // expose the modules object (__webpack_modules__)
    /******/
    __webpack_require__.m = modules;
    /******/
    /******/ // expose the module cache
    /******/
    __webpack_require__.c = installedModules;
    /******/
    /******/ // define getter function for harmony exports
    /******/
    __webpack_require__.d = function(exports, name, getter) {
        /******/
        if (!__webpack_require__.o(exports, name)) {
            /******/
            Object.defineProperty(exports, name, {
                /******/
                configurable: false,
                /******/
                enumerable: true,
                /******/
                get: getter
                /******/
            });
            /******/
        }
        /******/
    };
    /******/
    /******/ // getDefaultExport function for compatibility with non-harmony modules
    /******/
    __webpack_require__.n = function(module) {
        /******/
        var getter = module && module.__esModule ?
            /******/
            function getDefault() { return module['default']; } :
            /******/
            function getModuleExports() { return module; };
        /******/
        __webpack_require__.d(getter, 'a', getter);
        /******/
        return getter;
        /******/
    };
    /******/
    /******/ // Object.prototype.hasOwnProperty.call
    /******/
    __webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };
    /******/
    /******/ // __webpack_public_path__
    /******/
    __webpack_require__.p = "";
    /******/
    /******/ // Load entry module and return exports
    /******/
    return __webpack_require__(__webpack_require__.s = 1);
    /******/
})
/************************************************************************/
/******/
([
    /* 0  window对象*/
    /***/
    (function(module, exports) {

        var g;

        // This works in non-strict mode
        g = (function() {
            return this;
        })();

        try {
            // This works if eval is allowed (see CSP)
            g = g || Function("return this")() || (1, eval)("this");
        } catch (e) {
            // This works if the window reference is available
            if (typeof window === "object")
                g = window;
        }

        // g can still be undefined, but nothing to do about it...
        // We return undefined, instead of nothing here, so it's
        // easier to handle this case. if(!global) { ...}

        module.exports = g;


        /***/
    }),
    /* 1 */
    /***/
    (function(module, __webpack_exports__, __webpack_require__) {

        "use strict";
        Object.defineProperty(__webpack_exports__, "__esModule", { value: true });
        /* harmony import */
        var __WEBPACK_IMPORTED_MODULE_0__vue_js__ = __webpack_require__(2);
        /* harmony import */
        var __WEBPACK_IMPORTED_MODULE_0__vue_js___default = __webpack_require__.n(__WEBPACK_IMPORTED_MODULE_0__vue_js__);
        /* harmony import */
        var __WEBPACK_IMPORTED_MODULE_1__App_js__ = __webpack_require__(6);
        // es6 Module 

        // 整个项目的入口文件




        new __WEBPACK_IMPORTED_MODULE_0__vue_js___default.a({
            el: '#app',
            components: {
                App: __WEBPACK_IMPORTED_MODULE_1__App_js__["a" /* default */ ]
            },
            template: `
    <App />
  `
        });


        /***/
    }),
    /* 2 */
    /***/
    (function(module, exports, __webpack_require__) {

        /* WEBPACK VAR INJECTION */
        (function(global, setImmediate) {
            /*!
             * Vue.js v2.5.17
             * (c) 2014-2018 Evan You
             * Released under the MIT License.
             */
            (function(global, factory) {
                true ? module.exports = factory() :
                    typeof define === 'function' && define.amd ? define(factory) :
                    (global.Vue = factory());
            }(this, (function() {
                'use strict';

                /*  */

                var emptyObject = Object.freeze({});

                // these helpers produces better vm code in JS engines due to their
                // explicitness and function inlining
                function isUndef(v) {
                    return v === undefined || v === null
                }

                function isDef(v) {
                    return v !== undefined && v !== null
                }

                function isTrue(v) {
                    return v === true
                }

                function isFalse(v) {
                    return v === false
                }

                /**
                 * Check if value is primitive
                 */
                function isPrimitive(value) {
                    return (
                        typeof value === 'string' ||
                        typeof value === 'number' ||
                        // $flow-disable-line
                        typeof value === 'symbol' ||
                        typeof value === 'boolean'
                    )
                }

                /**
                 * Quick object check - this is primarily used to tell
                 * Objects from primitive values when we know the value
                 * is a JSON-compliant type.
                 */
                function isObject(obj) {
                    return obj !== null && typeof obj === 'object'
                }

                /**
                 * Get the raw type string of a value e.g. [object Object]
                 */
                var _toString = Object.prototype.toString;

                function toRawType(value) {
                    return _toString.call(value).slice(8, -1)
                }

                /**
                 * Strict object type check. Only returns true
                 * for plain JavaScript objects.
                 */
                function isPlainObject(obj) {
                    return _toString.call(obj) === '[object Object]'
                }

                function isRegExp(v) {
                    return _toString.call(v) === '[object RegExp]'
                }

                /**
                 * Check if val is a valid array index.
                 */
                function isValidArrayIndex(val) {
                    var n = parseFloat(String(val));
                    return n >= 0 && Math.floor(n) === n && isFinite(val)
                }

                /**
                 * Convert a value to a string that is actually rendered.
                 */
                function toString(val) {
                    return val == null ?
                        '' :
                        typeof val === 'object' ?
                        JSON.stringify(val, null, 2) :
                        String(val)
                }

                /**
                 * Convert a input value to a number for persistence.
                 * If the conversion fails, return original string.
                 */
                function toNumber(val) {
                    var n = parseFloat(val);
                    return isNaN(n) ? val : n
                }

                /**
                 * Make a map and return a function for checking if a key
                 * is in that map.
                 */
                function makeMap(
                    str,
                    expectsLowerCase
                ) {
                    var map = Object.create(null);
                    var list = str.split(',');
                    for (var i = 0; i < list.length; i++) {
                        map[list[i]] = true;
                    }
                    return expectsLowerCase ?
                        function(val) { return map[val.toLowerCase()]; } :
                        function(val) { return map[val]; }
                }

                /**
                 * Check if a tag is a built-in tag.
                 */
                var isBuiltInTag = makeMap('slot,component', true);

                /**
                 * Check if a attribute is a reserved attribute.
                 */
                var isReservedAttribute = makeMap('key,ref,slot,slot-scope,is');

                /**
                 * Remove an item from an array
                 */
                function remove(arr, item) {
                    if (arr.length) {
                        var index = arr.indexOf(item);
                        if (index > -1) {
                            return arr.splice(index, 1)
                        }
                    }
                }

                /**
                 * Check whether the object has the property.
                 */
                var hasOwnProperty = Object.prototype.hasOwnProperty;

                function hasOwn(obj, key) {
                    return hasOwnProperty.call(obj, key)
                }

                /**
                 * Create a cached version of a pure function.
                 */
                function cached(fn) {
                    var cache = Object.create(null);
                    return (function cachedFn(str) {
                        var hit = cache[str];
                        return hit || (cache[str] = fn(str))
                    })
                }

                /**
                 * Camelize a hyphen-delimited string.
                 */
                var camelizeRE = /-(\w)/g;
                var camelize = cached(function(str) {
                    return str.replace(camelizeRE, function(_, c) { return c ? c.toUpperCase() : ''; })
                });

                /**
                 * Capitalize a string.
                 */
                var capitalize = cached(function(str) {
                    return str.charAt(0).toUpperCase() + str.slice(1)
                });

                /**
                 * Hyphenate a camelCase string.
                 */
                var hyphenateRE = /\B([A-Z])/g;
                var hyphenate = cached(function(str) {
                    return str.replace(hyphenateRE, '-$1').toLowerCase()
                });

                /**
                 * Simple bind polyfill for environments that do not support it... e.g.
                 * PhantomJS 1.x. Technically we don't need this anymore since native bind is
                 * now more performant in most browsers, but removing it would be breaking for
                 * code that was able to run in PhantomJS 1.x, so this must be kept for
                 * backwards compatibility.
                 */

                /* istanbul ignore next */
                function polyfillBind(fn, ctx) {
                    function boundFn(a) {
                        var l = arguments.length;
                        return l ?
                            l > 1 ?
                            fn.apply(ctx, arguments) :
                            fn.call(ctx, a) :
                            fn.call(ctx)
                    }

                    boundFn._length = fn.length;
                    return boundFn
                }

                function nativeBind(fn, ctx) {
                    return fn.bind(ctx)
                }

                var bind = Function.prototype.bind ?
                    nativeBind :
                    polyfillBind;

                /**
                 * Convert an Array-like object to a real Array.
                 */
                function toArray(list, start) {
                    start = start || 0;
                    var i = list.length - start;
                    var ret = new Array(i);
                    while (i--) {
                        ret[i] = list[i + start];
                    }
                    return ret
                }

                /**
                 * Mix properties into target object.
                 */
                function extend(to, _from) {
                    for (var key in _from) {
                        to[key] = _from[key];
                    }
                    return to
                }

                /**
                 * Merge an Array of Objects into a single Object.
                 */
                function toObject(arr) {
                    var res = {};
                    for (var i = 0; i < arr.length; i++) {
                        if (arr[i]) {
                            extend(res, arr[i]);
                        }
                    }
                    return res
                }

                /**
                 * Perform no operation.
                 * Stubbing args to make Flow happy without leaving useless transpiled code
                 * with ...rest (https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/)
                 */
                function noop(a, b, c) {}

                /**
                 * Always return false.
                 */
                var no = function(a, b, c) { return false; };

                /**
                 * Return same value
                 */
                var identity = function(_) { return _; };

                /**
                 * Generate a static keys string from compiler modules.
                 */
                function genStaticKeys(modules) {
                    return modules.reduce(function(keys, m) {
                        return keys.concat(m.staticKeys || [])
                    }, []).join(',')
                }

                /**
                 * Check if two values are loosely equal - that is,
                 * if they are plain objects, do they have the same shape?
                 */
                function looseEqual(a, b) {
                    if (a === b) { return true }
                    var isObjectA = isObject(a);
                    var isObjectB = isObject(b);
                    if (isObjectA && isObjectB) {
                        try {
                            var isArrayA = Array.isArray(a);
                            var isArrayB = Array.isArray(b);
                            if (isArrayA && isArrayB) {
                                return a.length === b.length && a.every(function(e, i) {
                                    return looseEqual(e, b[i])
                                })
                            } else if (!isArrayA && !isArrayB) {
                                var keysA = Object.keys(a);
                                var keysB = Object.keys(b);
                                return keysA.length === keysB.length && keysA.every(function(key) {
                                    return looseEqual(a[key], b[key])
                                })
                            } else {
                                /* istanbul ignore next */
                                return false
                            }
                        } catch (e) {
                            /* istanbul ignore next */
                            return false
                        }
                    } else if (!isObjectA && !isObjectB) {
                        return String(a) === String(b)
                    } else {
                        return false
                    }
                }

                function looseIndexOf(arr, val) {
                    for (var i = 0; i < arr.length; i++) {
                        if (looseEqual(arr[i], val)) { return i }
                    }
                    return -1
                }

                /**
                 * Ensure a function is called only once.
                 */
                function once(fn) {
                    var called = false;
                    return function() {
                        if (!called) {
                            called = true;
                            fn.apply(this, arguments);
                        }
                    }
                }

                var SSR_ATTR = 'data-server-rendered';

                var ASSET_TYPES = [
                    'component',
                    'directive',
                    'filter'
                ];

                var LIFECYCLE_HOOKS = [
                    'beforeCreate',
                    'created',
                    'beforeMount',
                    'mounted',
                    'beforeUpdate',
                    'updated',
                    'beforeDestroy',
                    'destroyed',
                    'activated',
                    'deactivated',
                    'errorCaptured'
                ];

                /*  */

                var config = ({
                    /**
                     * Option merge strategies (used in core/util/options)
                     */
                    // $flow-disable-line
                    optionMergeStrategies: Object.create(null),

                    /**
                     * Whether to suppress warnings.
                     */
                    silent: false,

                    /**
                     * Show production mode tip message on boot?
                     */
                    productionTip: "development" !== 'production',

                    /**
                     * Whether to enable devtools
                     */
                    devtools: "development" !== 'production',

                    /**
                     * Whether to record perf
                     */
                    performance: false,

                    /**
                     * Error handler for watcher errors
                     */
                    errorHandler: null,

                    /**
                     * Warn handler for watcher warns
                     */
                    warnHandler: null,

                    /**
                     * Ignore certain custom elements
                     */
                    ignoredElements: [],

                    /**
                     * Custom user key aliases for v-on
                     */
                    // $flow-disable-line
                    keyCodes: Object.create(null),

                    /**
                     * Check if a tag is reserved so that it cannot be registered as a
                     * component. This is platform-dependent and may be overwritten.
                     */
                    isReservedTag: no,

                    /**
                     * Check if an attribute is reserved so that it cannot be used as a component
                     * prop. This is platform-dependent and may be overwritten.
                     */
                    isReservedAttr: no,

                    /**
                     * Check if a tag is an unknown element.
                     * Platform-dependent.
                     */
                    isUnknownElement: no,

                    /**
                     * Get the namespace of an element
                     */
                    getTagNamespace: noop,

                    /**
                     * Parse the real tag name for the specific platform.
                     */
                    parsePlatformTagName: identity,

                    /**
                     * Check if an attribute must be bound using property, e.g. value
                     * Platform-dependent.
                     */
                    mustUseProp: no,

                    /**
                     * Exposed for legacy reasons
                     */
                    _lifecycleHooks: LIFECYCLE_HOOKS
                })

                /*  */

                /**
                 * Check if a string starts with $ or _
                 */
                function isReserved(str) {
                    var c = (str + '').charCodeAt(0);
                    return c === 0x24 || c === 0x5F
                }

                /**
                 * Define a property.
                 */
                function def(obj, key, val, enumerable) {
                    Object.defineProperty(obj, key, {
                        value: val,
                        enumerable: !!enumerable,
                        writable: true,
                        configurable: true
                    });
                }

                /**
                 * Parse simple path.
                 */
                var bailRE = /[^\w.$]/;

                function parsePath(path) {
                    if (bailRE.test(path)) {
                        return
                    }
                    var segments = path.split('.');
                    return function(obj) {
                        for (var i = 0; i < segments.length; i++) {
                            if (!obj) { return }
                            obj = obj[segments[i]];
                        }
                        return obj
                    }
                }

                /*  */

                // can we use __proto__?
                var hasProto = '__proto__' in {};

                // Browser environment sniffing
                var inBrowser = typeof window !== 'undefined';
                var inWeex = typeof WXEnvironment !== 'undefined' && !!WXEnvironment.platform;
                var weexPlatform = inWeex && WXEnvironment.platform.toLowerCase();
                var UA = inBrowser && window.navigator.userAgent.toLowerCase();
                var isIE = UA && /msie|trident/.test(UA);
                var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
                var isEdge = UA && UA.indexOf('edge/') > 0;
                var isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android');
                var isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
                var isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;

                // Firefox has a "watch" function on Object.prototype...
                var nativeWatch = ({}).watch;

                var supportsPassive = false;
                if (inBrowser) {
                    try {
                        var opts = {};
                        Object.defineProperty(opts, 'passive', ({
                            get: function get() {
                                /* istanbul ignore next */
                                supportsPassive = true;
                            }
                        })); // https://github.com/facebook/flow/issues/285
                        window.addEventListener('test-passive', null, opts);
                    } catch (e) {}
                }

                // this needs to be lazy-evaled because vue may be required before
                // vue-server-renderer can set VUE_ENV
                var _isServer;
                var isServerRendering = function() {
                    if (_isServer === undefined) {
                        /* istanbul ignore if */
                        if (!inBrowser && !inWeex && typeof global !== 'undefined') {
                            // detect presence of vue-server-renderer and avoid
                            // Webpack shimming the process
                            _isServer = global['process'].env.VUE_ENV === 'server';
                        } else {
                            _isServer = false;
                        }
                    }
                    return _isServer
                };

                // detect devtools
                var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;

                /* istanbul ignore next */
                function isNative(Ctor) {
                    return typeof Ctor === 'function' && /native code/.test(Ctor.toString())
                }

                var hasSymbol =
                    typeof Symbol !== 'undefined' && isNative(Symbol) &&
                    typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);

                var _Set;
                /* istanbul ignore if */ // $flow-disable-line
                if (typeof Set !== 'undefined' && isNative(Set)) {
                    // use native Set when available.
                    _Set = Set;
                } else {
                    // a non-standard Set polyfill that only works with primitive keys.
                    _Set = (function() {
                        function Set() {
                            this.set = Object.create(null);
                        }
                        Set.prototype.has = function has(key) {
                            return this.set[key] === true
                        };
                        Set.prototype.add = function add(key) {
                            this.set[key] = true;
                        };
                        Set.prototype.clear = function clear() {
                            this.set = Object.create(null);
                        };

                        return Set;
                    }());
                }

                /*  */

                var warn = noop;
                var tip = noop;
                var generateComponentTrace = (noop); // work around flow check
                var formatComponentName = (noop);

                {
                    var hasConsole = typeof console !== 'undefined';
                    var classifyRE = /(?:^|[-_])(\w)/g;
                    var classify = function(str) {
                        return str
                            .replace(classifyRE, function(c) { return c.toUpperCase(); })
                            .replace(/[-_]/g, '');
                    };

                    warn = function(msg, vm) {
                        var trace = vm ? generateComponentTrace(vm) : '';

                        if (config.warnHandler) {
                            config.warnHandler.call(null, msg, vm, trace);
                        } else if (hasConsole && (!config.silent)) {
                            console.error(("[Vue warn]: " + msg + trace));
                        }
                    };

                    tip = function(msg, vm) {
                        if (hasConsole && (!config.silent)) {
                            console.warn("[Vue tip]: " + msg + (
                                vm ? generateComponentTrace(vm) : ''
                            ));
                        }
                    };

                    formatComponentName = function(vm, includeFile) {
                        if (vm.$root === vm) {
                            return '<Root>'
                        }
                        var options = typeof vm === 'function' && vm.cid != null ?
                            vm.options :
                            vm._isVue ?
                            vm.$options || vm.constructor.options :
                            vm || {};
                        var name = options.name || options._componentTag;
                        var file = options.__file;
                        if (!name && file) {
                            var match = file.match(/([^/\\]+)\.vue$/);
                            name = match && match[1];
                        }

                        return (
                            (name ? ("<" + (classify(name)) + ">") : "<Anonymous>") +
                            (file && includeFile !== false ? (" at " + file) : '')
                        )
                    };

                    var repeat = function(str, n) {
                        var res = '';
                        while (n) {
                            if (n % 2 === 1) { res += str; }
                            if (n > 1) { str += str; }
                            n >>= 1;
                        }
                        return res
                    };

                    generateComponentTrace = function(vm) {
                        if (vm._isVue && vm.$parent) {
                            var tree = [];
                            var currentRecursiveSequence = 0;
                            while (vm) {
                                if (tree.length > 0) {
                                    var last = tree[tree.length - 1];
                                    if (last.constructor === vm.constructor) {
                                        currentRecursiveSequence++;
                                        vm = vm.$parent;
                                        continue
                                    } else if (currentRecursiveSequence > 0) {
                                        tree[tree.length - 1] = [last, currentRecursiveSequence];
                                        currentRecursiveSequence = 0;
                                    }
                                }
                                tree.push(vm);
                                vm = vm.$parent;
                            }
                            return '\n\nfound in\n\n' + tree
                                .map(function(vm, i) {
                                    return ("" + (i === 0 ? '---> ' : repeat(' ', 5 + i * 2)) + (Array.isArray(vm) ?
                                        ((formatComponentName(vm[0])) + "... (" + (vm[1]) + " recursive calls)") :
                                        formatComponentName(vm)));
                                })
                                .join('\n')
                        } else {
                            return ("\n\n(found in " + (formatComponentName(vm)) + ")")
                        }
                    };
                }

                /*  */


                var uid = 0;

                /**
                 * A dep is an observable that can have multiple
                 * directives subscribing to it.
                 */
                var Dep = function Dep() {
                    this.id = uid++;
                    this.subs = [];
                };

                Dep.prototype.addSub = function addSub(sub) {
                    this.subs.push(sub);
                };

                Dep.prototype.removeSub = function removeSub(sub) {
                    remove(this.subs, sub);
                };

                Dep.prototype.depend = function depend() {
                    if (Dep.target) {
                        Dep.target.addDep(this);
                    }
                };

                Dep.prototype.notify = function notify() {
                    // stabilize the subscriber list first
                    var subs = this.subs.slice();
                    for (var i = 0, l = subs.length; i < l; i++) {
                        subs[i].update();
                    }
                };

                // the current target watcher being evaluated.
                // this is globally unique because there could be only one
                // watcher being evaluated at any time.
                Dep.target = null;
                var targetStack = [];

                function pushTarget(_target) {
                    if (Dep.target) { targetStack.push(Dep.target); }
                    Dep.target = _target;
                }

                function popTarget() {
                    Dep.target = targetStack.pop();
                }

                /*  */

                var VNode = function VNode(
                    tag,
                    data,
                    children,
                    text,
                    elm,
                    context,
                    componentOptions,
                    asyncFactory
                ) {
                    this.tag = tag;
                    this.data = data;
                    this.children = children;
                    this.text = text;
                    this.elm = elm;
                    this.ns = undefined;
                    this.context = context;
                    this.fnContext = undefined;
                    this.fnOptions = undefined;
                    this.fnScopeId = undefined;
                    this.key = data && data.key;
                    this.componentOptions = componentOptions;
                    this.componentInstance = undefined;
                    this.parent = undefined;
                    this.raw = false;
                    this.isStatic = false;
                    this.isRootInsert = true;
                    this.isComment = false;
                    this.isCloned = false;
                    this.isOnce = false;
                    this.asyncFactory = asyncFactory;
                    this.asyncMeta = undefined;
                    this.isAsyncPlaceholder = false;
                };

                var prototypeAccessors = { child: { configurable: true } };

                // DEPRECATED: alias for componentInstance for backwards compat.
                /* istanbul ignore next */
                prototypeAccessors.child.get = function() {
                    return this.componentInstance
                };

                Object.defineProperties(VNode.prototype, prototypeAccessors);

                var createEmptyVNode = function(text) {
                    if (text === void 0) text = '';

                    var node = new VNode();
                    node.text = text;
                    node.isComment = true;
                    return node
                };

                function createTextVNode(val) {
                    return new VNode(undefined, undefined, undefined, String(val))
                }

                // optimized shallow clone
                // used for static nodes and slot nodes because they may be reused across
                // multiple renders, cloning them avoids errors when DOM manipulations rely
                // on their elm reference.
                function cloneVNode(vnode) {
                    var cloned = new VNode(
                        vnode.tag,
                        vnode.data,
                        vnode.children,
                        vnode.text,
                        vnode.elm,
                        vnode.context,
                        vnode.componentOptions,
                        vnode.asyncFactory
                    );
                    cloned.ns = vnode.ns;
                    cloned.isStatic = vnode.isStatic;
                    cloned.key = vnode.key;
                    cloned.isComment = vnode.isComment;
                    cloned.fnContext = vnode.fnContext;
                    cloned.fnOptions = vnode.fnOptions;
                    cloned.fnScopeId = vnode.fnScopeId;
                    cloned.isCloned = true;
                    return cloned
                }

                /*
                 * not type checking this file because flow doesn't play well with
                 * dynamically accessing methods on Array prototype
                 */

                var arrayProto = Array.prototype;
                var arrayMethods = Object.create(arrayProto);

                var methodsToPatch = [
                    'push',
                    'pop',
                    'shift',
                    'unshift',
                    'splice',
                    'sort',
                    'reverse'
                ];

                /**
                 * Intercept mutating methods and emit events
                 */
                methodsToPatch.forEach(function(method) {
                    // cache original method
                    var original = arrayProto[method];
                    def(arrayMethods, method, function mutator() {
                        var args = [],
                            len = arguments.length;
                        while (len--) args[len] = arguments[len];

                        var result = original.apply(this, args);
                        var ob = this.__ob__;
                        var inserted;
                        switch (method) {
                            case 'push':
                            case 'unshift':
                                inserted = args;
                                break
                            case 'splice':
                                inserted = args.slice(2);
                                break
                        }
                        if (inserted) { ob.observeArray(inserted); }
                        // notify change
                        ob.dep.notify();
                        return result
                    });
                });

                /*  */

                var arrayKeys = Object.getOwnPropertyNames(arrayMethods);

                /**
                 * In some cases we may want to disable observation inside a component's
                 * update computation.
                 */
                var shouldObserve = true;

                function toggleObserving(value) {
                    shouldObserve = value;
                }

                /**
                 * Observer class that is attached to each observed
                 * object. Once attached, the observer converts the target
                 * object's property keys into getter/setters that
                 * collect dependencies and dispatch updates.
                 */
                var Observer = function Observer(value) {
                    this.value = value;
                    this.dep = new Dep();
                    this.vmCount = 0;
                    def(value, '__ob__', this);
                    if (Array.isArray(value)) {
                        var augment = hasProto ?
                            protoAugment :
                            copyAugment;
                        augment(value, arrayMethods, arrayKeys);
                        this.observeArray(value);
                    } else {
                        this.walk(value);
                    }
                };

                /**
                 * Walk through each property and convert them into
                 * getter/setters. This method should only be called when
                 * value type is Object.
                 */
                Observer.prototype.walk = function walk(obj) {
                    var keys = Object.keys(obj);
                    for (var i = 0; i < keys.length; i++) {
                        defineReactive(obj, keys[i]);
                    }
                };

                /**
                 * Observe a list of Array items.
                 */
                Observer.prototype.observeArray = function observeArray(items) {
                    for (var i = 0, l = items.length; i < l; i++) {
                        observe(items[i]);
                    }
                };

                // helpers

                /**
                 * Augment an target Object or Array by intercepting
                 * the prototype chain using __proto__
                 */
                function protoAugment(target, src, keys) {
                    /* eslint-disable no-proto */
                    target.__proto__ = src;
                    /* eslint-enable no-proto */
                }

                /**
                 * Augment an target Object or Array by defining
                 * hidden properties.
                 */
                /* istanbul ignore next */
                function copyAugment(target, src, keys) {
                    for (var i = 0, l = keys.length; i < l; i++) {
                        var key = keys[i];
                        def(target, key, src[key]);
                    }
                }

                /**
                 * Attempt to create an observer instance for a value,
                 * returns the new observer if successfully observed,
                 * or the existing observer if the value already has one.
                 */
                function observe(value, asRootData) {
                    if (!isObject(value) || value instanceof VNode) {
                        return
                    }
                    var ob;
                    if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
                        ob = value.__ob__;
                    } else if (
                        shouldObserve &&
                        !isServerRendering() &&
                        (Array.isArray(value) || isPlainObject(value)) &&
                        Object.isExtensible(value) &&
                        !value._isVue
                    ) {
                        ob = new Observer(value);
                    }
                    if (asRootData && ob) {
                        ob.vmCount++;
                    }
                    return ob
                }

                /**
                 * Define a reactive property on an Object.
                 */
                function defineReactive(
                    obj,
                    key,
                    val,
                    customSetter,
                    shallow
                ) {
                    var dep = new Dep();

                    var property = Object.getOwnPropertyDescriptor(obj, key);
                    if (property && property.configurable === false) {
                        return
                    }

                    // cater for pre-defined getter/setters
                    var getter = property && property.get;
                    if (!getter && arguments.length === 2) {
                        val = obj[key];
                    }
                    var setter = property && property.set;

                    var childOb = !shallow && observe(val);
                    Object.defineProperty(obj, key, {
                        enumerable: true,
                        configurable: true,
                        get: function reactiveGetter() {
                            var value = getter ? getter.call(obj) : val;
                            if (Dep.target) {
                                dep.depend();
                                if (childOb) {
                                    childOb.dep.depend();
                                    if (Array.isArray(value)) {
                                        dependArray(value);
                                    }
                                }
                            }
                            return value
                        },
                        set: function reactiveSetter(newVal) {
                            var value = getter ? getter.call(obj) : val;
                            /* eslint-disable no-self-compare */
                            if (newVal === value || (newVal !== newVal && value !== value)) {
                                return
                            }
                            /* eslint-enable no-self-compare */
                            if ("development" !== 'production' && customSetter) {
                                customSetter();
                            }
                            if (setter) {
                                setter.call(obj, newVal);
                            } else {
                                val = newVal;
                            }
                            childOb = !shallow && observe(newVal);
                            dep.notify();
                        }
                    });
                }

                /**
                 * Set a property on an object. Adds the new property and
                 * triggers change notification if the property doesn't
                 * already exist.
                 */
                function set(target, key, val) {
                    if ("development" !== 'production' &&
                        (isUndef(target) || isPrimitive(target))
                    ) {
                        warn(("Cannot set reactive property on undefined, null, or primitive value: " + ((target))));
                    }
                    if (Array.isArray(target) && isValidArrayIndex(key)) {
                        target.length = Math.max(target.length, key);
                        target.splice(key, 1, val);
                        return val
                    }
                    if (key in target && !(key in Object.prototype)) {
                        target[key] = val;
                        return val
                    }
                    var ob = (target).__ob__;
                    if (target._isVue || (ob && ob.vmCount)) {
                        "development" !== 'production' && warn(
                            'Avoid adding reactive properties to a Vue instance or its root $data ' +
                            'at runtime - declare it upfront in the data option.'
                        );
                        return val
                    }
                    if (!ob) {
                        target[key] = val;
                        return val
                    }
                    defineReactive(ob.value, key, val);
                    ob.dep.notify();
                    return val
                }

                /**
                 * Delete a property and trigger change if necessary.
                 */
                function del(target, key) {
                    if ("development" !== 'production' &&
                        (isUndef(target) || isPrimitive(target))
                    ) {
                        warn(("Cannot delete reactive property on undefined, null, or primitive value: " + ((target))));
                    }
                    if (Array.isArray(target) && isValidArrayIndex(key)) {
                        target.splice(key, 1);
                        return
                    }
                    var ob = (target).__ob__;
                    if (target._isVue || (ob && ob.vmCount)) {
                        "development" !== 'production' && warn(
                            'Avoid deleting properties on a Vue instance or its root $data ' +
                            '- just set it to null.'
                        );
                        return
                    }
                    if (!hasOwn(target, key)) {
                        return
                    }
                    delete target[key];
                    if (!ob) {
                        return
                    }
                    ob.dep.notify();
                }

                /**
                 * Collect dependencies on array elements when the array is touched, since
                 * we cannot intercept array element access like property getters.
                 */
                function dependArray(value) {
                    for (var e = (void 0), i = 0, l = value.length; i < l; i++) {
                        e = value[i];
                        e && e.__ob__ && e.__ob__.dep.depend();
                        if (Array.isArray(e)) {
                            dependArray(e);
                        }
                    }
                }

                /*  */

                /**
                 * Option overwriting strategies are functions that handle
                 * how to merge a parent option value and a child option
                 * value into the final value.
                 */
                var strats = config.optionMergeStrategies;

                /**
                 * Options with restrictions
                 */
                {
                    strats.el = strats.propsData = function(parent, child, vm, key) {
                        if (!vm) {
                            warn(
                                "option \"" + key + "\" can only be used during instance " +
                                'creation with the `new` keyword.'
                            );
                        }
                        return defaultStrat(parent, child)
                    };
                }

                /**
                 * Helper that recursively merges two data objects together.
                 */
                function mergeData(to, from) {
                    if (!from) { return to }
                    var key, toVal, fromVal;
                    var keys = Object.keys(from);
                    for (var i = 0; i < keys.length; i++) {
                        key = keys[i];
                        toVal = to[key];
                        fromVal = from[key];
                        if (!hasOwn(to, key)) {
                            set(to, key, fromVal);
                        } else if (isPlainObject(toVal) && isPlainObject(fromVal)) {
                            mergeData(toVal, fromVal);
                        }
                    }
                    return to
                }

                /**
                 * Data
                 */
                function mergeDataOrFn(
                    parentVal,
                    childVal,
                    vm
                ) {
                    if (!vm) {
                        // in a Vue.extend merge, both should be functions
                        if (!childVal) {
                            return parentVal
                        }
                        if (!parentVal) {
                            return childVal
                        }
                        // when parentVal & childVal are both present,
                        // we need to return a function that returns the
                        // merged result of both functions... no need to
                        // check if parentVal is a function here because
                        // it has to be a function to pass previous merges.
                        return function mergedDataFn() {
                            return mergeData(
                                typeof childVal === 'function' ? childVal.call(this, this) : childVal,
                                typeof parentVal === 'function' ? parentVal.call(this, this) : parentVal
                            )
                        }
                    } else {
                        return function mergedInstanceDataFn() {
                            // instance merge
                            var instanceData = typeof childVal === 'function' ?
                                childVal.call(vm, vm) :
                                childVal;
                            var defaultData = typeof parentVal === 'function' ?
                                parentVal.call(vm, vm) :
                                parentVal;
                            if (instanceData) {
                                return mergeData(instanceData, defaultData)
                            } else {
                                return defaultData
                            }
                        }
                    }
                }

                strats.data = function(
                    parentVal,
                    childVal,
                    vm
                ) {
                    if (!vm) {
                        if (childVal && typeof childVal !== 'function') {
                            "development" !== 'production' && warn(
                                'The "data" option should be a function ' +
                                'that returns a per-instance value in component ' +
                                'definitions.',
                                vm
                            );

                            return parentVal
                        }
                        return mergeDataOrFn(parentVal, childVal)
                    }

                    return mergeDataOrFn(parentVal, childVal, vm)
                };

                /**
                 * Hooks and props are merged as arrays.
                 */
                function mergeHook(
                    parentVal,
                    childVal
                ) {
                    return childVal ?
                        parentVal ?
                        parentVal.concat(childVal) :
                        Array.isArray(childVal) ?
                        childVal :
                        [childVal] :
                        parentVal
                }

                LIFECYCLE_HOOKS.forEach(function(hook) {
                    strats[hook] = mergeHook;
                });

                /**
                 * Assets
                 *
                 * When a vm is present (instance creation), we need to do
                 * a three-way merge between constructor options, instance
                 * options and parent options.
                 */
                function mergeAssets(
                    parentVal,
                    childVal,
                    vm,
                    key
                ) {
                    var res = Object.create(parentVal || null);
                    if (childVal) {
                        "development" !== 'production' && assertObjectType(key, childVal, vm);
                        return extend(res, childVal)
                    } else {
                        return res
                    }
                }

                ASSET_TYPES.forEach(function(type) {
                    strats[type + 's'] = mergeAssets;
                });

                /**
                 * Watchers.
                 *
                 * Watchers hashes should not overwrite one
                 * another, so we merge them as arrays.
                 */
                strats.watch = function(
                    parentVal,
                    childVal,
                    vm,
                    key
                ) {
                    // work around Firefox's Object.prototype.watch...
                    if (parentVal === nativeWatch) { parentVal = undefined; }
                    if (childVal === nativeWatch) { childVal = undefined; }
                    /* istanbul ignore if */
                    if (!childVal) { return Object.create(parentVal || null) } {
                        assertObjectType(key, childVal, vm);
                    }
                    if (!parentVal) { return childVal }
                    var ret = {};
                    extend(ret, parentVal);
                    for (var key$1 in childVal) {
                        var parent = ret[key$1];
                        var child = childVal[key$1];
                        if (parent && !Array.isArray(parent)) {
                            parent = [parent];
                        }
                        ret[key$1] = parent ?
                            parent.concat(child) :
                            Array.isArray(child) ? child : [child];
                    }
                    return ret
                };

                /**
                 * Other object hashes.
                 */
                strats.props =
                    strats.methods =
                    strats.inject =
                    strats.computed = function(
                        parentVal,
                        childVal,
                        vm,
                        key
                    ) {
                        if (childVal && "development" !== 'production') {
                            assertObjectType(key, childVal, vm);
                        }
                        if (!parentVal) { return childVal }
                        var ret = Object.create(null);
                        extend(ret, parentVal);
                        if (childVal) { extend(ret, childVal); }
                        return ret
                    };
                strats.provide = mergeDataOrFn;

                /**
                 * Default strategy.
                 */
                var defaultStrat = function(parentVal, childVal) {
                    return childVal === undefined ?
                        parentVal :
                        childVal
                };

                /**
                 * Validate component names
                 */
                function checkComponents(options) {
                    for (var key in options.components) {
                        validateComponentName(key);
                    }
                }

                function validateComponentName(name) {
                    if (!/^[a-zA-Z][\w-]*$/.test(name)) {
                        warn(
                            'Invalid component name: "' + name + '". Component names ' +
                            'can only contain alphanumeric characters and the hyphen, ' +
                            'and must start with a letter.'
                        );
                    }
                    if (isBuiltInTag(name) || config.isReservedTag(name)) {
                        warn(
                            'Do not use built-in or reserved HTML elements as component ' +
                            'id: ' + name
                        );
                    }
                }

                /**
                 * Ensure all props option syntax are normalized into the
                 * Object-based format.
                 */
                function normalizeProps(options, vm) {
                    var props = options.props;
                    if (!props) { return }
                    var res = {};
                    var i, val, name;
                    if (Array.isArray(props)) {
                        i = props.length;
                        while (i--) {
                            val = props[i];
                            if (typeof val === 'string') {
                                name = camelize(val);
                                res[name] = { type: null };
                            } else {
                                warn('props must be strings when using array syntax.');
                            }
                        }
                    } else if (isPlainObject(props)) {
                        for (var key in props) {
                            val = props[key];
                            name = camelize(key);
                            res[name] = isPlainObject(val) ?
                                val :
                                { type: val };
                        }
                    } else {
                        warn(
                            "Invalid value for option \"props\": expected an Array or an Object, " +
                            "but got " + (toRawType(props)) + ".",
                            vm
                        );
                    }
                    options.props = res;
                }

                /**
                 * Normalize all injections into Object-based format
                 */
                function normalizeInject(options, vm) {
                    var inject = options.inject;
                    if (!inject) { return }
                    var normalized = options.inject = {};
                    if (Array.isArray(inject)) {
                        for (var i = 0; i < inject.length; i++) {
                            normalized[inject[i]] = { from: inject[i] };
                        }
                    } else if (isPlainObject(inject)) {
                        for (var key in inject) {
                            var val = inject[key];
                            normalized[key] = isPlainObject(val) ?
                                extend({ from: key }, val) :
                                { from: val };
                        }
                    } else {
                        warn(
                            "Invalid value for option \"inject\": expected an Array or an Object, " +
                            "but got " + (toRawType(inject)) + ".",
                            vm
                        );
                    }
                }

                /**
                 * Normalize raw function directives into object format.
                 */
                function normalizeDirectives(options) {
                    var dirs = options.directives;
                    if (dirs) {
                        for (var key in dirs) {
                            var def = dirs[key];
                            if (typeof def === 'function') {
                                dirs[key] = { bind: def, update: def };
                            }
                        }
                    }
                }

                function assertObjectType(name, value, vm) {
                    if (!isPlainObject(value)) {
                        warn(
                            "Invalid value for option \"" + name + "\": expected an Object, " +
                            "but got " + (toRawType(value)) + ".",
                            vm
                        );
                    }
                }

                /**
                 * Merge two option objects into a new one.
                 * Core utility used in both instantiation and inheritance.
                 */
                function mergeOptions(
                    parent,
                    child,
                    vm
                ) {
                    {
                        checkComponents(child);
                    }

                    if (typeof child === 'function') {
                        child = child.options;
                    }

                    normalizeProps(child, vm);
                    normalizeInject(child, vm);
                    normalizeDirectives(child);
                    var extendsFrom = child.extends;
                    if (extendsFrom) {
                        parent = mergeOptions(parent, extendsFrom, vm);
                    }
                    if (child.mixins) {
                        for (var i = 0, l = child.mixins.length; i < l; i++) {
                            parent = mergeOptions(parent, child.mixins[i], vm);
                        }
                    }
                    var options = {};
                    var key;
                    for (key in parent) {
                        mergeField(key);
                    }
                    for (key in child) {
                        if (!hasOwn(parent, key)) {
                            mergeField(key);
                        }
                    }

                    function mergeField(key) {
                        var strat = strats[key] || defaultStrat;
                        options[key] = strat(parent[key], child[key], vm, key);
                    }
                    return options
                }

                /**
                 * Resolve an asset.
                 * This function is used because child instances need access
                 * to assets defined in its ancestor chain.
                 */
                function resolveAsset(
                    options,
                    type,
                    id,
                    warnMissing
                ) {
                    /* istanbul ignore if */
                    if (typeof id !== 'string') {
                        return
                    }
                    var assets = options[type];
                    // check local registration variations first
                    if (hasOwn(assets, id)) { return assets[id] }
                    var camelizedId = camelize(id);
                    if (hasOwn(assets, camelizedId)) { return assets[camelizedId] }
                    var PascalCaseId = capitalize(camelizedId);
                    if (hasOwn(assets, PascalCaseId)) { return assets[PascalCaseId] }
                    // fallback to prototype chain
                    var res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
                    if ("development" !== 'production' && warnMissing && !res) {
                        warn(
                            'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
                            options
                        );
                    }
                    return res
                }

                /*  */

                function validateProp(
                    key,
                    propOptions,
                    propsData,
                    vm
                ) {
                    var prop = propOptions[key];
                    var absent = !hasOwn(propsData, key);
                    var value = propsData[key];
                    // boolean casting
                    var booleanIndex = getTypeIndex(Boolean, prop.type);
                    if (booleanIndex > -1) {
                        if (absent && !hasOwn(prop, 'default')) {
                            value = false;
                        } else if (value === '' || value === hyphenate(key)) {
                            // only cast empty string / same name to boolean if
                            // boolean has higher priority
                            var stringIndex = getTypeIndex(String, prop.type);
                            if (stringIndex < 0 || booleanIndex < stringIndex) {
                                value = true;
                            }
                        }
                    }
                    // check default value
                    if (value === undefined) {
                        value = getPropDefaultValue(vm, prop, key);
                        // since the default value is a fresh copy,
                        // make sure to observe it.
                        var prevShouldObserve = shouldObserve;
                        toggleObserving(true);
                        observe(value);
                        toggleObserving(prevShouldObserve);
                    } {
                        assertProp(prop, key, value, vm, absent);
                    }
                    return value
                }

                /**
                 * Get the default value of a prop.
                 */
                function getPropDefaultValue(vm, prop, key) {
                    // no default, return undefined
                    if (!hasOwn(prop, 'default')) {
                        return undefined
                    }
                    var def = prop.default;
                    // warn against non-factory defaults for Object & Array
                    if ("development" !== 'production' && isObject(def)) {
                        warn(
                            'Invalid default value for prop "' + key + '": ' +
                            'Props with type Object/Array must use a factory function ' +
                            'to return the default value.',
                            vm
                        );
                    }
                    // the raw prop value was also undefined from previous render,
                    // return previous default value to avoid unnecessary watcher trigger
                    if (vm && vm.$options.propsData &&
                        vm.$options.propsData[key] === undefined &&
                        vm._props[key] !== undefined
                    ) {
                        return vm._props[key]
                    }
                    // call factory function for non-Function types
                    // a value is Function if its prototype is function even across different execution context
                    return typeof def === 'function' && getType(prop.type) !== 'Function' ?
                        def.call(vm) :
                        def
                }

                /**
                 * Assert whether a prop is valid.
                 */
                function assertProp(
                    prop,
                    name,
                    value,
                    vm,
                    absent
                ) {
                    if (prop.required && absent) {
                        warn(
                            'Missing required prop: "' + name + '"',
                            vm
                        );
                        return
                    }
                    if (value == null && !prop.required) {
                        return
                    }
                    var type = prop.type;
                    var valid = !type || type === true;
                    var expectedTypes = [];
                    if (type) {
                        if (!Array.isArray(type)) {
                            type = [type];
                        }
                        for (var i = 0; i < type.length && !valid; i++) {
                            var assertedType = assertType(value, type[i]);
                            expectedTypes.push(assertedType.expectedType || '');
                            valid = assertedType.valid;
                        }
                    }
                    if (!valid) {
                        warn(
                            "Invalid prop: type check failed for prop \"" + name + "\"." +
                            " Expected " + (expectedTypes.map(capitalize).join(', ')) +
                            ", got " + (toRawType(value)) + ".",
                            vm
                        );
                        return
                    }
                    var validator = prop.validator;
                    if (validator) {
                        if (!validator(value)) {
                            warn(
                                'Invalid prop: custom validator check failed for prop "' + name + '".',
                                vm
                            );
                        }
                    }
                }

                var simpleCheckRE = /^(String|Number|Boolean|Function|Symbol)$/;

                function assertType(value, type) {
                    var valid;
                    var expectedType = getType(type);
                    if (simpleCheckRE.test(expectedType)) {
                        var t = typeof value;
                        valid = t === expectedType.toLowerCase();
                        // for primitive wrapper objects
                        if (!valid && t === 'object') {
                            valid = value instanceof type;
                        }
                    } else if (expectedType === 'Object') {
                        valid = isPlainObject(value);
                    } else if (expectedType === 'Array') {
                        valid = Array.isArray(value);
                    } else {
                        valid = value instanceof type;
                    }
                    return {
                        valid: valid,
                        expectedType: expectedType
                    }
                }

                /**
                 * Use function string name to check built-in types,
                 * because a simple equality check will fail when running
                 * across different vms / iframes.
                 */
                function getType(fn) {
                    var match = fn && fn.toString().match(/^\s*function (\w+)/);
                    return match ? match[1] : ''
                }

                function isSameType(a, b) {
                    return getType(a) === getType(b)
                }

                function getTypeIndex(type, expectedTypes) {
                    if (!Array.isArray(expectedTypes)) {
                        return isSameType(expectedTypes, type) ? 0 : -1
                    }
                    for (var i = 0, len = expectedTypes.length; i < len; i++) {
                        if (isSameType(expectedTypes[i], type)) {
                            return i
                        }
                    }
                    return -1
                }

                /*  */

                function handleError(err, vm, info) {
                    if (vm) {
                        var cur = vm;
                        while ((cur = cur.$parent)) {
                            var hooks = cur.$options.errorCaptured;
                            if (hooks) {
                                for (var i = 0; i < hooks.length; i++) {
                                    try {
                                        var capture = hooks[i].call(cur, err, vm, info) === false;
                                        if (capture) { return }
                                    } catch (e) {
                                        globalHandleError(e, cur, 'errorCaptured hook');
                                    }
                                }
                            }
                        }
                    }
                    globalHandleError(err, vm, info);
                }

                function globalHandleError(err, vm, info) {
                    if (config.errorHandler) {
                        try {
                            return config.errorHandler.call(null, err, vm, info)
                        } catch (e) {
                            logError(e, null, 'config.errorHandler');
                        }
                    }
                    logError(err, vm, info);
                }

                function logError(err, vm, info) {
                    {
                        warn(("Error in " + info + ": \"" + (err.toString()) + "\""), vm);
                    }
                    /* istanbul ignore else */
                    if ((inBrowser || inWeex) && typeof console !== 'undefined') {
                        console.error(err);
                    } else {
                        throw err
                    }
                }

                /*  */
                /* globals MessageChannel */

                var callbacks = [];
                var pending = false;

                function flushCallbacks() {
                    pending = false;
                    var copies = callbacks.slice(0);
                    callbacks.length = 0;
                    for (var i = 0; i < copies.length; i++) {
                        copies[i]();
                    }
                }

                // Here we have async deferring wrappers using both microtasks and (macro) tasks.
                // In < 2.4 we used microtasks everywhere, but there are some scenarios where
                // microtasks have too high a priority and fire in between supposedly
                // sequential events (e.g. #4521, #6690) or even between bubbling of the same
                // event (#6566). However, using (macro) tasks everywhere also has subtle problems
                // when state is changed right before repaint (e.g. #6813, out-in transitions).
                // Here we use microtask by default, but expose a way to force (macro) task when
                // needed (e.g. in event handlers attached by v-on).
                var microTimerFunc;
                var macroTimerFunc;
                var useMacroTask = false;

                // Determine (macro) task defer implementation.
                // Technically setImmediate should be the ideal choice, but it's only available
                // in IE. The only polyfill that consistently queues the callback after all DOM
                // events triggered in the same loop is by using MessageChannel.
                /* istanbul ignore if */
                if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) {
                    macroTimerFunc = function() {
                        setImmediate(flushCallbacks);
                    };
                } else if (typeof MessageChannel !== 'undefined' && (
                        isNative(MessageChannel) ||
                        // PhantomJS
                        MessageChannel.toString() === '[object MessageChannelConstructor]'
                    )) {
                    var channel = new MessageChannel();
                    var port = channel.port2;
                    channel.port1.onmessage = flushCallbacks;
                    macroTimerFunc = function() {
                        port.postMessage(1);
                    };
                } else {
                    /* istanbul ignore next */
                    macroTimerFunc = function() {
                        setTimeout(flushCallbacks, 0);
                    };
                }

                // Determine microtask defer implementation.
                /* istanbul ignore next, $flow-disable-line */
                if (typeof Promise !== 'undefined' && isNative(Promise)) {
                    var p = Promise.resolve();
                    microTimerFunc = function() {
                        p.then(flushCallbacks);
                        // in problematic UIWebViews, Promise.then doesn't completely break, but
                        // it can get stuck in a weird state where callbacks are pushed into the
                        // microtask queue but the queue isn't being flushed, until the browser
                        // needs to do some other work, e.g. handle a timer. Therefore we can
                        // "force" the microtask queue to be flushed by adding an empty timer.
                        if (isIOS) { setTimeout(noop); }
                    };
                } else {
                    // fallback to macro
                    microTimerFunc = macroTimerFunc;
                }

                /**
                 * Wrap a function so that if any code inside triggers state change,
                 * the changes are queued using a (macro) task instead of a microtask.
                 */
                function withMacroTask(fn) {
                    return fn._withTask || (fn._withTask = function() {
                        useMacroTask = true;
                        var res = fn.apply(null, arguments);
                        useMacroTask = false;
                        return res
                    })
                }

                function nextTick(cb, ctx) {
                    var _resolve;
                    callbacks.push(function() {
                        if (cb) {
                            try {
                                cb.call(ctx);
                            } catch (e) {
                                handleError(e, ctx, 'nextTick');
                            }
                        } else if (_resolve) {
                            _resolve(ctx);
                        }
                    });
                    if (!pending) {
                        pending = true;
                        if (useMacroTask) {
                            macroTimerFunc();
                        } else {
                            microTimerFunc();
                        }
                    }
                    // $flow-disable-line
                    if (!cb && typeof Promise !== 'undefined') {
                        return new Promise(function(resolve) {
                            _resolve = resolve;
                        })
                    }
                }

                /*  */

                var mark;
                var measure;

                {
                    var perf = inBrowser && window.performance;
                    /* istanbul ignore if */
                    if (
                        perf &&
                        perf.mark &&
                        perf.measure &&
                        perf.clearMarks &&
                        perf.clearMeasures
                    ) {
                        mark = function(tag) { return perf.mark(tag); };
                        measure = function(name, startTag, endTag) {
                            perf.measure(name, startTag, endTag);
                            perf.clearMarks(startTag);
                            perf.clearMarks(endTag);
                            perf.clearMeasures(name);
                        };
                    }
                }

                /* not type checking this file because flow doesn't play well with Proxy */

                var initProxy;

                {
                    var allowedGlobals = makeMap(
                        'Infinity,undefined,NaN,isFinite,isNaN,' +
                        'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
                        'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +
                        'require' // for Webpack/Browserify
                    );

                    var warnNonPresent = function(target, key) {
                        warn(
                            "Property or method \"" + key + "\" is not defined on the instance but " +
                            'referenced during render. Make sure that this property is reactive, ' +
                            'either in the data option, or for class-based components, by ' +
                            'initializing the property. ' +
                            'See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.',
                            target
                        );
                    };

                    var hasProxy =
                        typeof Proxy !== 'undefined' && isNative(Proxy);

                    if (hasProxy) {
                        var isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta,exact');
                        config.keyCodes = new Proxy(config.keyCodes, {
                            set: function set(target, key, value) {
                                if (isBuiltInModifier(key)) {
                                    warn(("Avoid overwriting built-in modifier in config.keyCodes: ." + key));
                                    return false
                                } else {
                                    target[key] = value;
                                    return true
                                }
                            }
                        });
                    }

                    var hasHandler = {
                        has: function has(target, key) {
                            var has = key in target;
                            var isAllowed = allowedGlobals(key) || key.charAt(0) === '_';
                            if (!has && !isAllowed) {
                                warnNonPresent(target, key);
                            }
                            return has || !isAllowed
                        }
                    };

                    var getHandler = {
                        get: function get(target, key) {
                            if (typeof key === 'string' && !(key in target)) {
                                warnNonPresent(target, key);
                            }
                            return target[key]
                        }
                    };

                    initProxy = function initProxy(vm) {
                        if (hasProxy) {
                            // determine which proxy handler to use
                            var options = vm.$options;
                            var handlers = options.render && options.render._withStripped ?
                                getHandler :
                                hasHandler;
                            vm._renderProxy = new Proxy(vm, handlers);
                        } else {
                            vm._renderProxy = vm;
                        }
                    };
                }

                /*  */

                var seenObjects = new _Set();

                /**
                 * Recursively traverse an object to evoke all converted
                 * getters, so that every nested property inside the object
                 * is collected as a "deep" dependency.
                 */
                function traverse(val) {
                    _traverse(val, seenObjects);
                    seenObjects.clear();
                }

                function _traverse(val, seen) {
                    var i, keys;
                    var isA = Array.isArray(val);
                    if ((!isA && !isObject(val)) || Object.isFrozen(val) || val instanceof VNode) {
                        return
                    }
                    if (val.__ob__) {
                        var depId = val.__ob__.dep.id;
                        if (seen.has(depId)) {
                            return
                        }
                        seen.add(depId);
                    }
                    if (isA) {
                        i = val.length;
                        while (i--) { _traverse(val[i], seen); }
                    } else {
                        keys = Object.keys(val);
                        i = keys.length;
                        while (i--) { _traverse(val[keys[i]], seen); }
                    }
                }

                /*  */

                var normalizeEvent = cached(function(name) {
                    var passive = name.charAt(0) === '&';
                    name = passive ? name.slice(1) : name;
                    var once$$1 = name.charAt(0) === '~'; // Prefixed last, checked first
                    name = once$$1 ? name.slice(1) : name;
                    var capture = name.charAt(0) === '!';
                    name = capture ? name.slice(1) : name;
                    return {
                        name: name,
                        once: once$$1,
                        capture: capture,
                        passive: passive
                    }
                });

                function createFnInvoker(fns) {
                    function invoker() {
                        var arguments$1 = arguments;

                        var fns = invoker.fns;
                        if (Array.isArray(fns)) {
                            var cloned = fns.slice();
                            for (var i = 0; i < cloned.length; i++) {
                                cloned[i].apply(null, arguments$1);
                            }
                        } else {
                            // return handler return value for single handlers
                            return fns.apply(null, arguments)
                        }
                    }
                    invoker.fns = fns;
                    return invoker
                }

                function updateListeners(
                    on,
                    oldOn,
                    add,
                    remove$$1,
                    vm
                ) {
                    var name, def, cur, old, event;
                    for (name in on) {
                        def = cur = on[name];
                        old = oldOn[name];
                        event = normalizeEvent(name);
                        /* istanbul ignore if */
                        if (isUndef(cur)) {
                            "development" !== 'production' && warn(
                                "Invalid handler for event \"" + (event.name) + "\": got " + String(cur),
                                vm
                            );
                        } else if (isUndef(old)) {
                            if (isUndef(cur.fns)) {
                                cur = on[name] = createFnInvoker(cur);
                            }
                            add(event.name, cur, event.once, event.capture, event.passive, event.params);
                        } else if (cur !== old) {
                            old.fns = cur;
                            on[name] = old;
                        }
                    }
                    for (name in oldOn) {
                        if (isUndef(on[name])) {
                            event = normalizeEvent(name);
                            remove$$1(event.name, oldOn[name], event.capture);
                        }
                    }
                }

                /*  */

                function mergeVNodeHook(def, hookKey, hook) {
                    if (def instanceof VNode) {
                        def = def.data.hook || (def.data.hook = {});
                    }
                    var invoker;
                    var oldHook = def[hookKey];

                    function wrappedHook() {
                        hook.apply(this, arguments);
                        // important: remove merged hook to ensure it's called only once
                        // and prevent memory leak
                        remove(invoker.fns, wrappedHook);
                    }

                    if (isUndef(oldHook)) {
                        // no existing hook
                        invoker = createFnInvoker([wrappedHook]);
                    } else {
                        /* istanbul ignore if */
                        if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {
                            // already a merged invoker
                            invoker = oldHook;
                            invoker.fns.push(wrappedHook);
                        } else {
                            // existing plain hook
                            invoker = createFnInvoker([oldHook, wrappedHook]);
                        }
                    }

                    invoker.merged = true;
                    def[hookKey] = invoker;
                }

                /*  */

                function extractPropsFromVNodeData(
                    data,
                    Ctor,
                    tag
                ) {
                    // we are only extracting raw values here.
                    // validation and default values are handled in the child
                    // component itself.
                    var propOptions = Ctor.options.props;
                    if (isUndef(propOptions)) {
                        return
                    }
                    var res = {};
                    var attrs = data.attrs;
                    var props = data.props;
                    if (isDef(attrs) || isDef(props)) {
                        for (var key in propOptions) {
                            var altKey = hyphenate(key); {
                                var keyInLowerCase = key.toLowerCase();
                                if (
                                    key !== keyInLowerCase &&
                                    attrs && hasOwn(attrs, keyInLowerCase)
                                ) {
                                    tip(
                                        "Prop \"" + keyInLowerCase + "\" is passed to component " +
                                        (formatComponentName(tag || Ctor)) + ", but the declared prop name is" +
                                        " \"" + key + "\". " +
                                        "Note that HTML attributes are case-insensitive and camelCased " +
                                        "props need to use their kebab-case equivalents when using in-DOM " +
                                        "templates. You should probably use \"" + altKey + "\" instead of \"" + key + "\"."
                                    );
                                }
                            }
                            checkProp(res, props, key, altKey, true) ||
                                checkProp(res, attrs, key, altKey, false);
                        }
                    }
                    return res
                }

                function checkProp(
                    res,
                    hash,
                    key,
                    altKey,
                    preserve
                ) {
                    if (isDef(hash)) {
                        if (hasOwn(hash, key)) {
                            res[key] = hash[key];
                            if (!preserve) {
                                delete hash[key];
                            }
                            return true
                        } else if (hasOwn(hash, altKey)) {
                            res[key] = hash[altKey];
                            if (!preserve) {
                                delete hash[altKey];
                            }
                            return true
                        }
                    }
                    return false
                }

                /*  */

                // The template compiler attempts to minimize the need for normalization by
                // statically analyzing the template at compile time.
                //
                // For plain HTML markup, normalization can be completely skipped because the
                // generated render function is guaranteed to return Array<VNode>. There are
                // two cases where extra normalization is needed:

                // 1. When the children contains components - because a functional component
                // may return an Array instead of a single root. In this case, just a simple
                // normalization is needed - if any child is an Array, we flatten the whole
                // thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
                // because functional components already normalize their own children.
                function simpleNormalizeChildren(children) {
                    for (var i = 0; i < children.length; i++) {
                        if (Array.isArray(children[i])) {
                            return Array.prototype.concat.apply([], children)
                        }
                    }
                    return children
                }

                // 2. When the children contains constructs that always generated nested Arrays,
                // e.g. <template>, <slot>, v-for, or when the children is provided by user
                // with hand-written render functions / JSX. In such cases a full normalization
                // is needed to cater to all possible types of children values.
                function normalizeChildren(children) {
                    return isPrimitive(children) ?
                        [createTextVNode(children)] :
                        Array.isArray(children) ?
                        normalizeArrayChildren(children) :
                        undefined
                }

                function isTextNode(node) {
                    return isDef(node) && isDef(node.text) && isFalse(node.isComment)
                }

                function normalizeArrayChildren(children, nestedIndex) {
                    var res = [];
                    var i, c, lastIndex, last;
                    for (i = 0; i < children.length; i++) {
                        c = children[i];
                        if (isUndef(c) || typeof c === 'boolean') { continue }
                        lastIndex = res.length - 1;
                        last = res[lastIndex];
                        //  nested
                        if (Array.isArray(c)) {
                            if (c.length > 0) {
                                c = normalizeArrayChildren(c, ((nestedIndex || '') + "_" + i));
                                // merge adjacent text nodes
                                if (isTextNode(c[0]) && isTextNode(last)) {
                                    res[lastIndex] = createTextVNode(last.text + (c[0]).text);
                                    c.shift();
                                }
                                res.push.apply(res, c);
                            }
                        } else if (isPrimitive(c)) {
                            if (isTextNode(last)) {
                                // merge adjacent text nodes
                                // this is necessary for SSR hydration because text nodes are
                                // essentially merged when rendered to HTML strings
                                res[lastIndex] = createTextVNode(last.text + c);
                            } else if (c !== '') {
                                // convert primitive to vnode
                                res.push(createTextVNode(c));
                            }
                        } else {
                            if (isTextNode(c) && isTextNode(last)) {
                                // merge adjacent text nodes
                                res[lastIndex] = createTextVNode(last.text + c.text);
                            } else {
                                // default key for nested array children (likely generated by v-for)
                                if (isTrue(children._isVList) &&
                                    isDef(c.tag) &&
                                    isUndef(c.key) &&
                                    isDef(nestedIndex)) {
                                    c.key = "__vlist" + nestedIndex + "_" + i + "__";
                                }
                                res.push(c);
                            }
                        }
                    }
                    return res
                }

                /*  */

                function ensureCtor(comp, base) {
                    if (
                        comp.__esModule ||
                        (hasSymbol && comp[Symbol.toStringTag] === 'Module')
                    ) {
                        comp = comp.default;
                    }
                    return isObject(comp) ?
                        base.extend(comp) :
                        comp
                }

                function createAsyncPlaceholder(
                    factory,
                    data,
                    context,
                    children,
                    tag
                ) {
                    var node = createEmptyVNode();
                    node.asyncFactory = factory;
                    node.asyncMeta = { data: data, context: context, children: children, tag: tag };
                    return node
                }

                function resolveAsyncComponent(
                    factory,
                    baseCtor,
                    context
                ) {
                    if (isTrue(factory.error) && isDef(factory.errorComp)) {
                        return factory.errorComp
                    }

                    if (isDef(factory.resolved)) {
                        return factory.resolved
                    }

                    if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
                        return factory.loadingComp
                    }

                    if (isDef(factory.contexts)) {
                        // already pending
                        factory.contexts.push(context);
                    } else {
                        var contexts = factory.contexts = [context];
                        var sync = true;

                        var forceRender = function() {
                            for (var i = 0, l = contexts.length; i < l; i++) {
                                contexts[i].$forceUpdate();
                            }
                        };

                        var resolve = once(function(res) {
                            // cache resolved
                            factory.resolved = ensureCtor(res, baseCtor);
                            // invoke callbacks only if this is not a synchronous resolve
                            // (async resolves are shimmed as synchronous during SSR)
                            if (!sync) {
                                forceRender();
                            }
                        });

                        var reject = once(function(reason) {
                            "development" !== 'production' && warn(
                                "Failed to resolve async component: " + (String(factory)) +
                                (reason ? ("\nReason: " + reason) : '')
                            );
                            if (isDef(factory.errorComp)) {
                                factory.error = true;
                                forceRender();
                            }
                        });

                        var res = factory(resolve, reject);

                        if (isObject(res)) {
                            if (typeof res.then === 'function') {
                                // () => Promise
                                if (isUndef(factory.resolved)) {
                                    res.then(resolve, reject);
                                }
                            } else if (isDef(res.component) && typeof res.component.then === 'function') {
                                res.component.then(resolve, reject);

                                if (isDef(res.error)) {
                                    factory.errorComp = ensureCtor(res.error, baseCtor);
                                }

                                if (isDef(res.loading)) {
                                    factory.loadingComp = ensureCtor(res.loading, baseCtor);
                                    if (res.delay === 0) {
                                        factory.loading = true;
                                    } else {
                                        setTimeout(function() {
                                            if (isUndef(factory.resolved) && isUndef(factory.error)) {
                                                factory.loading = true;
                                                forceRender();
                                            }
                                        }, res.delay || 200);
                                    }
                                }

                                if (isDef(res.timeout)) {
                                    setTimeout(function() {
                                        if (isUndef(factory.resolved)) {
                                            reject(
                                                "timeout (" + (res.timeout) + "ms)"
                                            );
                                        }
                                    }, res.timeout);
                                }
                            }
                        }

                        sync = false;
                        // return in case resolved synchronously
                        return factory.loading ?
                            factory.loadingComp :
                            factory.resolved
                    }
                }

                /*  */

                function isAsyncPlaceholder(node) {
                    return node.isComment && node.asyncFactory
                }

                /*  */

                function getFirstComponentChild(children) {
                    if (Array.isArray(children)) {
                        for (var i = 0; i < children.length; i++) {
                            var c = children[i];
                            if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
                                return c
                            }
                        }
                    }
                }

                /*  */

                /*  */

                function initEvents(vm) {
                    vm._events = Object.create(null);
                    vm._hasHookEvent = false;
                    // init parent attached events
                    var listeners = vm.$options._parentListeners;
                    if (listeners) {
                        updateComponentListeners(vm, listeners);
                    }
                }

                var target;

                function add(event, fn, once) {
                    if (once) {
                        target.$once(event, fn);
                    } else {
                        target.$on(event, fn);
                    }
                }

                function remove$1(event, fn) {
                    target.$off(event, fn);
                }

                function updateComponentListeners(
                    vm,
                    listeners,
                    oldListeners
                ) {
                    target = vm;
                    updateListeners(listeners, oldListeners || {}, add, remove$1, vm);
                    target = undefined;
                }

                function eventsMixin(Vue) {
                    var hookRE = /^hook:/;
                    Vue.prototype.$on = function(event, fn) {
                        var this$1 = this;

                        var vm = this;
                        if (Array.isArray(event)) {
                            for (var i = 0, l = event.length; i < l; i++) {
                                this$1.$on(event[i], fn);
                            }
                        } else {
                            (vm._events[event] || (vm._events[event] = [])).push(fn);
                            // optimize hook:event cost by using a boolean flag marked at registration
                            // instead of a hash lookup
                            if (hookRE.test(event)) {
                                vm._hasHookEvent = true;
                            }
                        }
                        return vm
                    };

                    Vue.prototype.$once = function(event, fn) {
                        var vm = this;

                        function on() {
                            vm.$off(event, on);
                            fn.apply(vm, arguments);
                        }
                        on.fn = fn;
                        vm.$on(event, on);
                        return vm
                    };

                    Vue.prototype.$off = function(event, fn) {
                        var this$1 = this;

                        var vm = this;
                        // all
                        if (!arguments.length) {
                            vm._events = Object.create(null);
                            return vm
                        }
                        // array of events
                        if (Array.isArray(event)) {
                            for (var i = 0, l = event.length; i < l; i++) {
                                this$1.$off(event[i], fn);
                            }
                            return vm
                        }
                        // specific event
                        var cbs = vm._events[event];
                        if (!cbs) {
                            return vm
                        }
                        if (!fn) {
                            vm._events[event] = null;
                            return vm
                        }
                        if (fn) {
                            // specific handler
                            var cb;
                            var i$1 = cbs.length;
                            while (i$1--) {
                                cb = cbs[i$1];
                                if (cb === fn || cb.fn === fn) {
                                    cbs.splice(i$1, 1);
                                    break
                                }
                            }
                        }
                        return vm
                    };

                    Vue.prototype.$emit = function(event) {
                        var vm = this; {
                            var lowerCaseEvent = event.toLowerCase();
                            if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
                                tip(
                                    "Event \"" + lowerCaseEvent + "\" is emitted in component " +
                                    (formatComponentName(vm)) + " but the handler is registered for \"" + event + "\". " +
                                    "Note that HTML attributes are case-insensitive and you cannot use " +
                                    "v-on to listen to camelCase events when using in-DOM templates. " +
                                    "You should probably use \"" + (hyphenate(event)) + "\" instead of \"" + event + "\"."
                                );
                            }
                        }
                        var cbs = vm._events[event];
                        if (cbs) {
                            cbs = cbs.length > 1 ? toArray(cbs) : cbs;
                            var args = toArray(arguments, 1);
                            for (var i = 0, l = cbs.length; i < l; i++) {
                                try {
                                    cbs[i].apply(vm, args);
                                } catch (e) {
                                    handleError(e, vm, ("event handler for \"" + event + "\""));
                                }
                            }
                        }
                        return vm
                    };
                }

                /*  */



                /**
                 * Runtime helper for resolving raw children VNodes into a slot object.
                 */
                function resolveSlots(
                    children,
                    context
                ) {
                    var slots = {};
                    if (!children) {
                        return slots
                    }
                    for (var i = 0, l = children.length; i < l; i++) {
                        var child = children[i];
                        var data = child.data;
                        // remove slot attribute if the node is resolved as a Vue slot node
                        if (data && data.attrs && data.attrs.slot) {
                            delete data.attrs.slot;
                        }
                        // named slots should only be respected if the vnode was rendered in the
                        // same context.
                        if ((child.context === context || child.fnContext === context) &&
                            data && data.slot != null
                        ) {
                            var name = data.slot;
                            var slot = (slots[name] || (slots[name] = []));
                            if (child.tag === 'template') {
                                slot.push.apply(slot, child.children || []);
                            } else {
                                slot.push(child);
                            }
                        } else {
                            (slots.default || (slots.default = [])).push(child);
                        }
                    }
                    // ignore slots that contains only whitespace
                    for (var name$1 in slots) {
                        if (slots[name$1].every(isWhitespace)) {
                            delete slots[name$1];
                        }
                    }
                    return slots
                }

                function isWhitespace(node) {
                    return (node.isComment && !node.asyncFactory) || node.text === ' '
                }

                function resolveScopedSlots(
                    fns, // see flow/vnode
                    res
                ) {
                    res = res || {};
                    for (var i = 0; i < fns.length; i++) {
                        if (Array.isArray(fns[i])) {
                            resolveScopedSlots(fns[i], res);
                        } else {
                            res[fns[i].key] = fns[i].fn;
                        }
                    }
                    return res
                }

                /*  */

                var activeInstance = null;
                var isUpdatingChildComponent = false;

                function initLifecycle(vm) {
                    var options = vm.$options;

                    // locate first non-abstract parent
                    var parent = options.parent;
                    if (parent && !options.abstract) {
                        while (parent.$options.abstract && parent.$parent) {
                            parent = parent.$parent;
                        }
                        parent.$children.push(vm);
                    }

                    vm.$parent = parent;
                    vm.$root = parent ? parent.$root : vm;

                    vm.$children = [];
                    vm.$refs = {};

                    vm._watcher = null;
                    vm._inactive = null;
                    vm._directInactive = false;
                    vm._isMounted = false;
                    vm._isDestroyed = false;
                    vm._isBeingDestroyed = false;
                }

                function lifecycleMixin(Vue) {
                    Vue.prototype._update = function(vnode, hydrating) {
                        var vm = this;
                        if (vm._isMounted) {
                            callHook(vm, 'beforeUpdate');
                        }
                        var prevEl = vm.$el;
                        var prevVnode = vm._vnode;
                        var prevActiveInstance = activeInstance;
                        activeInstance = vm;
                        vm._vnode = vnode;
                        // Vue.prototype.__patch__ is injected in entry points
                        // based on the rendering backend used.
                        if (!prevVnode) {
                            // initial render
                            vm.$el = vm.__patch__(
                                vm.$el, vnode, hydrating, false /* removeOnly */ ,
                                vm.$options._parentElm,
                                vm.$options._refElm
                            );
                            // no need for the ref nodes after initial patch
                            // this prevents keeping a detached DOM tree in memory (#5851)
                            vm.$options._parentElm = vm.$options._refElm = null;
                        } else {
                            // updates
                            vm.$el = vm.__patch__(prevVnode, vnode);
                        }
                        activeInstance = prevActiveInstance;
                        // update __vue__ reference
                        if (prevEl) {
                            prevEl.__vue__ = null;
                        }
                        if (vm.$el) {
                            vm.$el.__vue__ = vm;
                        }
                        // if parent is an HOC, update its $el as well
                        if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
                            vm.$parent.$el = vm.$el;
                        }
                        // updated hook is called by the scheduler to ensure that children are
                        // updated in a parent's updated hook.
                    };

                    Vue.prototype.$forceUpdate = function() {
                        var vm = this;
                        if (vm._watcher) {
                            vm._watcher.update();
                        }
                    };

                    Vue.prototype.$destroy = function() {
                        var vm = this;
                        if (vm._isBeingDestroyed) {
                            return
                        }
                        callHook(vm, 'beforeDestroy');
                        vm._isBeingDestroyed = true;
                        // remove self from parent
                        var parent = vm.$parent;
                        if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
                            remove(parent.$children, vm);
                        }
                        // teardown watchers
                        if (vm._watcher) {
                            vm._watcher.teardown();
                        }
                        var i = vm._watchers.length;
                        while (i--) {
                            vm._watchers[i].teardown();
                        }
                        // remove reference from data ob
                        // frozen object may not have observer.
                        if (vm._data.__ob__) {
                            vm._data.__ob__.vmCount--;
                        }
                        // call the last hook...
                        vm._isDestroyed = true;
                        // invoke destroy hooks on current rendered tree
                        vm.__patch__(vm._vnode, null);
                        // fire destroyed hook
                        callHook(vm, 'destroyed');
                        // turn off all instance listeners.
                        vm.$off();
                        // remove __vue__ reference
                        if (vm.$el) {
                            vm.$el.__vue__ = null;
                        }
                        // release circular reference (#6759)
                        if (vm.$vnode) {
                            vm.$vnode.parent = null;
                        }
                    };
                }

                function mountComponent(
                    vm,
                    el,
                    hydrating
                ) {
                    vm.$el = el;
                    if (!vm.$options.render) {
                        vm.$options.render = createEmptyVNode; {
                            /* istanbul ignore if */
                            if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
                                vm.$options.el || el) {
                                warn(
                                    'You are using the runtime-only build of Vue where the template ' +
                                    'compiler is not available. Either pre-compile the templates into ' +
                                    'render functions, or use the compiler-included build.',
                                    vm
                                );
                            } else {
                                warn(
                                    'Failed to mount component: template or render function not defined.',
                                    vm
                                );
                            }
                        }
                    }
                    callHook(vm, 'beforeMount');

                    var updateComponent;
                    /* istanbul ignore if */
                    if ("development" !== 'production' && config.performance && mark) {
                        updateComponent = function() {
                            var name = vm._name;
                            var id = vm._uid;
                            var startTag = "vue-perf-start:" + id;
                            var endTag = "vue-perf-end:" + id;

                            mark(startTag);
                            var vnode = vm._render();
                            mark(endTag);
                            measure(("vue " + name + " render"), startTag, endTag);

                            mark(startTag);
                            vm._update(vnode, hydrating);
                            mark(endTag);
                            measure(("vue " + name + " patch"), startTag, endTag);
                        };
                    } else {
                        updateComponent = function() {
                            vm._update(vm._render(), hydrating);
                        };
                    }

                    // we set this to vm._watcher inside the watcher's constructor
                    // since the watcher's initial patch may call $forceUpdate (e.g. inside child
                    // component's mounted hook), which relies on vm._watcher being already defined
                    new Watcher(vm, updateComponent, noop, null, true /* isRenderWatcher */ );
                    hydrating = false;

                    // manually mounted instance, call mounted on self
                    // mounted is called for render-created child components in its inserted hook
                    if (vm.$vnode == null) {
                        vm._isMounted = true;
                        callHook(vm, 'mounted');
                    }
                    return vm
                }

                function updateChildComponent(
                    vm,
                    propsData,
                    listeners,
                    parentVnode,
                    renderChildren
                ) {
                    {
                        isUpdatingChildComponent = true;
                    }

                    // determine whether component has slot children
                    // we need to do this before overwriting $options._renderChildren
                    var hasChildren = !!(
                        renderChildren || // has new static slots
                        vm.$options._renderChildren || // has old static slots
                        parentVnode.data.scopedSlots || // has new scoped slots
                        vm.$scopedSlots !== emptyObject // has old scoped slots
                    );

                    vm.$options._parentVnode = parentVnode;
                    vm.$vnode = parentVnode; // update vm's placeholder node without re-render

                    if (vm._vnode) { // update child tree's parent
                        vm._vnode.parent = parentVnode;
                    }
                    vm.$options._renderChildren = renderChildren;

                    // update $attrs and $listeners hash
                    // these are also reactive so they may trigger child update if the child
                    // used them during render
                    vm.$attrs = parentVnode.data.attrs || emptyObject;
                    vm.$listeners = listeners || emptyObject;

                    // update props
                    if (propsData && vm.$options.props) {
                        toggleObserving(false);
                        var props = vm._props;
                        var propKeys = vm.$options._propKeys || [];
                        for (var i = 0; i < propKeys.length; i++) {
                            var key = propKeys[i];
                            var propOptions = vm.$options.props; // wtf flow?
                            props[key] = validateProp(key, propOptions, propsData, vm);
                        }
                        toggleObserving(true);
                        // keep a copy of raw propsData
                        vm.$options.propsData = propsData;
                    }

                    // update listeners
                    listeners = listeners || emptyObject;
                    var oldListeners = vm.$options._parentListeners;
                    vm.$options._parentListeners = listeners;
                    updateComponentListeners(vm, listeners, oldListeners);

                    // resolve slots + force update if has children
                    if (hasChildren) {
                        vm.$slots = resolveSlots(renderChildren, parentVnode.context);
                        vm.$forceUpdate();
                    }

                    {
                        isUpdatingChildComponent = false;
                    }
                }

                function isInInactiveTree(vm) {
                    while (vm && (vm = vm.$parent)) {
                        if (vm._inactive) { return true }
                    }
                    return false
                }

                function activateChildComponent(vm, direct) {
                    if (direct) {
                        vm._directInactive = false;
                        if (isInInactiveTree(vm)) {
                            return
                        }
                    } else if (vm._directInactive) {
                        return
                    }
                    if (vm._inactive || vm._inactive === null) {
                        vm._inactive = false;
                        for (var i = 0; i < vm.$children.length; i++) {
                            activateChildComponent(vm.$children[i]);
                        }
                        callHook(vm, 'activated');
                    }
                }

                function deactivateChildComponent(vm, direct) {
                    if (direct) {
                        vm._directInactive = true;
                        if (isInInactiveTree(vm)) {
                            return
                        }
                    }
                    if (!vm._inactive) {
                        vm._inactive = true;
                        for (var i = 0; i < vm.$children.length; i++) {
                            deactivateChildComponent(vm.$children[i]);
                        }
                        callHook(vm, 'deactivated');
                    }
                }

                function callHook(vm, hook) {
                    // #7573 disable dep collection when invoking lifecycle hooks
                    pushTarget();
                    var handlers = vm.$options[hook];
                    if (handlers) {
                        for (var i = 0, j = handlers.length; i < j; i++) {
                            try {
                                handlers[i].call(vm);
                            } catch (e) {
                                handleError(e, vm, (hook + " hook"));
                            }
                        }
                    }
                    if (vm._hasHookEvent) {
                        vm.$emit('hook:' + hook);
                    }
                    popTarget();
                }

                /*  */


                var MAX_UPDATE_COUNT = 100;

                var queue = [];
                var activatedChildren = [];
                var has = {};
                var circular = {};
                var waiting = false;
                var flushing = false;
                var index = 0;

                /**
                 * Reset the scheduler's state.
                 */
                function resetSchedulerState() {
                    index = queue.length = activatedChildren.length = 0;
                    has = {}; {
                        circular = {};
                    }
                    waiting = flushing = false;
                }

                /**
                 * Flush both queues and run the watchers.
                 */
                function flushSchedulerQueue() {
                    flushing = true;
                    var watcher, id;

                    // Sort queue before flush.
                    // This ensures that:
                    // 1. Components are updated from parent to child. (because parent is always
                    //    created before the child)
                    // 2. A component's user watchers are run before its render watcher (because
                    //    user watchers are created before the render watcher)
                    // 3. If a component is destroyed during a parent component's watcher run,
                    //    its watchers can be skipped.
                    queue.sort(function(a, b) { return a.id - b.id; });

                    // do not cache length because more watchers might be pushed
                    // as we run existing watchers
                    for (index = 0; index < queue.length; index++) {
                        watcher = queue[index];
                        id = watcher.id;
                        has[id] = null;
                        watcher.run();
                        // in dev build, check and stop circular updates.
                        if ("development" !== 'production' && has[id] != null) {
                            circular[id] = (circular[id] || 0) + 1;
                            if (circular[id] > MAX_UPDATE_COUNT) {
                                warn(
                                    'You may have an infinite update loop ' + (
                                        watcher.user ?
                                        ("in watcher with expression \"" + (watcher.expression) + "\"") :
                                        "in a component render function."
                                    ),
                                    watcher.vm
                                );
                                break
                            }
                        }
                    }

                    // keep copies of post queues before resetting state
                    var activatedQueue = activatedChildren.slice();
                    var updatedQueue = queue.slice();

                    resetSchedulerState();

                    // call component updated and activated hooks
                    callActivatedHooks(activatedQueue);
                    callUpdatedHooks(updatedQueue);

                    // devtool hook
                    /* istanbul ignore if */
                    if (devtools && config.devtools) {
                        devtools.emit('flush');
                    }
                }

                function callUpdatedHooks(queue) {
                    var i = queue.length;
                    while (i--) {
                        var watcher = queue[i];
                        var vm = watcher.vm;
                        if (vm._watcher === watcher && vm._isMounted) {
                            callHook(vm, 'updated');
                        }
                    }
                }

                /**
                 * Queue a kept-alive component that was activated during patch.
                 * The queue will be processed after the entire tree has been patched.
                 */
                function queueActivatedComponent(vm) {
                    // setting _inactive to false here so that a render function can
                    // rely on checking whether it's in an inactive tree (e.g. router-view)
                    vm._inactive = false;
                    activatedChildren.push(vm);
                }

                function callActivatedHooks(queue) {
                    for (var i = 0; i < queue.length; i++) {
                        queue[i]._inactive = true;
                        activateChildComponent(queue[i], true /* true */ );
                    }
                }

                /**
                 * Push a watcher into the watcher queue.
                 * Jobs with duplicate IDs will be skipped unless it's
                 * pushed when the queue is being flushed.
                 */
                function queueWatcher(watcher) {
                    var id = watcher.id;
                    if (has[id] == null) {
                        has[id] = true;
                        if (!flushing) {
                            queue.push(watcher);
                        } else {
                            // if already flushing, splice the watcher based on its id
                            // if already past its id, it will be run next immediately.
                            var i = queue.length - 1;
                            while (i > index && queue[i].id > watcher.id) {
                                i--;
                            }
                            queue.splice(i + 1, 0, watcher);
                        }
                        // queue the flush
                        if (!waiting) {
                            waiting = true;
                            nextTick(flushSchedulerQueue);
                        }
                    }
                }

                /*  */

                var uid$1 = 0;

                /**
                 * A watcher parses an expression, collects dependencies,
                 * and fires callback when the expression value changes.
                 * This is used for both the $watch() api and directives.
                 */
                var Watcher = function Watcher(
                    vm,
                    expOrFn,
                    cb,
                    options,
                    isRenderWatcher
                ) {
                    this.vm = vm;
                    if (isRenderWatcher) {
                        vm._watcher = this;
                    }
                    vm._watchers.push(this);
                    // options
                    if (options) {
                        this.deep = !!options.deep;
                        this.user = !!options.user;
                        this.lazy = !!options.lazy;
                        this.sync = !!options.sync;
                    } else {
                        this.deep = this.user = this.lazy = this.sync = false;
                    }
                    this.cb = cb;
                    this.id = ++uid$1; // uid for batching
                    this.active = true;
                    this.dirty = this.lazy; // for lazy watchers
                    this.deps = [];
                    this.newDeps = [];
                    this.depIds = new _Set();
                    this.newDepIds = new _Set();
                    this.expression = expOrFn.toString();
                    // parse expression for getter
                    if (typeof expOrFn === 'function') {
                        this.getter = expOrFn;
                    } else {
                        this.getter = parsePath(expOrFn);
                        if (!this.getter) {
                            this.getter = function() {};
                            "development" !== 'production' && warn(
                                "Failed watching path: \"" + expOrFn + "\" " +
                                'Watcher only accepts simple dot-delimited paths. ' +
                                'For full control, use a function instead.',
                                vm
                            );
                        }
                    }
                    this.value = this.lazy ?
                        undefined :
                        this.get();
                };

                /**
                 * Evaluate the getter, and re-collect dependencies.
                 */
                Watcher.prototype.get = function get() {
                    pushTarget(this);
                    var value;
                    var vm = this.vm;
                    try {
                        value = this.getter.call(vm, vm);
                    } catch (e) {
                        if (this.user) {
                            handleError(e, vm, ("getter for watcher \"" + (this.expression) + "\""));
                        } else {
                            throw e
                        }
                    } finally {
                        // "touch" every property so they are all tracked as
                        // dependencies for deep watching
                        if (this.deep) {
                            traverse(value);
                        }
                        popTarget();
                        this.cleanupDeps();
                    }
                    return value
                };

                /**
                 * Add a dependency to this directive.
                 */
                Watcher.prototype.addDep = function addDep(dep) {
                    var id = dep.id;
                    if (!this.newDepIds.has(id)) {
                        this.newDepIds.add(id);
                        this.newDeps.push(dep);
                        if (!this.depIds.has(id)) {
                            dep.addSub(this);
                        }
                    }
                };

                /**
                 * Clean up for dependency collection.
                 */
                Watcher.prototype.cleanupDeps = function cleanupDeps() {
                    var this$1 = this;

                    var i = this.deps.length;
                    while (i--) {
                        var dep = this$1.deps[i];
                        if (!this$1.newDepIds.has(dep.id)) {
                            dep.removeSub(this$1);
                        }
                    }
                    var tmp = this.depIds;
                    this.depIds = this.newDepIds;
                    this.newDepIds = tmp;
                    this.newDepIds.clear();
                    tmp = this.deps;
                    this.deps = this.newDeps;
                    this.newDeps = tmp;
                    this.newDeps.length = 0;
                };

                /**
                 * Subscriber interface.
                 * Will be called when a dependency changes.
                 */
                Watcher.prototype.update = function update() {
                    /* istanbul ignore else */
                    if (this.lazy) {
                        this.dirty = true;
                    } else if (this.sync) {
                        this.run();
                    } else {
                        queueWatcher(this);
                    }
                };

                /**
                 * Scheduler job interface.
                 * Will be called by the scheduler.
                 */
                Watcher.prototype.run = function run() {
                    if (this.active) {
                        var value = this.get();
                        if (
                            value !== this.value ||
                            // Deep watchers and watchers on Object/Arrays should fire even
                            // when the value is the same, because the value may
                            // have mutated.
                            isObject(value) ||
                            this.deep
                        ) {
                            // set new value
                            var oldValue = this.value;
                            this.value = value;
                            if (this.user) {
                                try {
                                    this.cb.call(this.vm, value, oldValue);
                                } catch (e) {
                                    handleError(e, this.vm, ("callback for watcher \"" + (this.expression) + "\""));
                                }
                            } else {
                                this.cb.call(this.vm, value, oldValue);
                            }
                        }
                    }
                };

                /**
                 * Evaluate the value of the watcher.
                 * This only gets called for lazy watchers.
                 */
                Watcher.prototype.evaluate = function evaluate() {
                    this.value = this.get();
                    this.dirty = false;
                };

                /**
                 * Depend on all deps collected by this watcher.
                 */
                Watcher.prototype.depend = function depend() {
                    var this$1 = this;

                    var i = this.deps.length;
                    while (i--) {
                        this$1.deps[i].depend();
                    }
                };

                /**
                 * Remove self from all dependencies' subscriber list.
                 */
                Watcher.prototype.teardown = function teardown() {
                    var this$1 = this;

                    if (this.active) {
                        // remove self from vm's watcher list
                        // this is a somewhat expensive operation so we skip it
                        // if the vm is being destroyed.
                        if (!this.vm._isBeingDestroyed) {
                            remove(this.vm._watchers, this);
                        }
                        var i = this.deps.length;
                        while (i--) {
                            this$1.deps[i].removeSub(this$1);
                        }
                        this.active = false;
                    }
                };

                /*  */

                var sharedPropertyDefinition = {
                    enumerable: true,
                    configurable: true,
                    get: noop,
                    set: noop
                };

                function proxy(target, sourceKey, key) {
                    sharedPropertyDefinition.get = function proxyGetter() {
                        return this[sourceKey][key]
                    };
                    sharedPropertyDefinition.set = function proxySetter(val) {
                        this[sourceKey][key] = val;
                    };
                    Object.defineProperty(target, key, sharedPropertyDefinition);
                }

                function initState(vm) {
                    vm._watchers = [];
                    var opts = vm.$options;
                    if (opts.props) { initProps(vm, opts.props); }
                    if (opts.methods) { initMethods(vm, opts.methods); }
                    if (opts.data) {
                        initData(vm);
                    } else {
                        observe(vm._data = {}, true /* asRootData */ );
                    }
                    if (opts.computed) { initComputed(vm, opts.computed); }
                    if (opts.watch && opts.watch !== nativeWatch) {
                        initWatch(vm, opts.watch);
                    }
                }

                function initProps(vm, propsOptions) {
                    var propsData = vm.$options.propsData || {};
                    var props = vm._props = {};
                    // cache prop keys so that future props updates can iterate using Array
                    // instead of dynamic object key enumeration.
                    var keys = vm.$options._propKeys = [];
                    var isRoot = !vm.$parent;
                    // root instance props should be converted
                    if (!isRoot) {
                        toggleObserving(false);
                    }
                    var loop = function(key) {
                        keys.push(key);
                        var value = validateProp(key, propsOptions, propsData, vm);
                        /* istanbul ignore else */
                        {
                            var hyphenatedKey = hyphenate(key);
                            if (isReservedAttribute(hyphenatedKey) ||
                                config.isReservedAttr(hyphenatedKey)) {
                                warn(
                                    ("\"" + hyphenatedKey + "\" is a reserved attribute and cannot be used as component prop."),
                                    vm
                                );
                            }
                            defineReactive(props, key, value, function() {
                                if (vm.$parent && !isUpdatingChildComponent) {
                                    warn(
                                        "Avoid mutating a prop directly since the value will be " +
                                        "overwritten whenever the parent component re-renders. " +
                                        "Instead, use a data or computed property based on the prop's " +
                                        "value. Prop being mutated: \"" + key + "\"",
                                        vm
                                    );
                                }
                            });
                        }
                        // static props are already proxied on the component's prototype
                        // during Vue.extend(). We only need to proxy props defined at
                        // instantiation here.
                        if (!(key in vm)) {
                            proxy(vm, "_props", key);
                        }
                    };

                    for (var key in propsOptions) loop(key);
                    toggleObserving(true);
                }

                function initData(vm) {
                    var data = vm.$options.data;
                    data = vm._data = typeof data === 'function' ?
                        getData(data, vm) :
                        data || {};
                    if (!isPlainObject(data)) {
                        data = {};
                        "development" !== 'production' && warn(
                            'data functions should return an object:\n' +
                            'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
                            vm
                        );
                    }
                    // proxy data on instance
                    var keys = Object.keys(data);
                    var props = vm.$options.props;
                    var methods = vm.$options.methods;
                    var i = keys.length;
                    while (i--) {
                        var key = keys[i]; {
                            if (methods && hasOwn(methods, key)) {
                                warn(
                                    ("Method \"" + key + "\" has already been defined as a data property."),
                                    vm
                                );
                            }
                        }
                        if (props && hasOwn(props, key)) {
                            "development" !== 'production' && warn(
                                "The data property \"" + key + "\" is already declared as a prop. " +
                                "Use prop default value instead.",
                                vm
                            );
                        } else if (!isReserved(key)) {
                            proxy(vm, "_data", key);
                        }
                    }
                    // observe data
                    observe(data, true /* asRootData */ );
                }

                function getData(data, vm) {
                    // #7573 disable dep collection when invoking data getters
                    pushTarget();
                    try {
                        return data.call(vm, vm)
                    } catch (e) {
                        handleError(e, vm, "data()");
                        return {}
                    } finally {
                        popTarget();
                    }
                }

                var computedWatcherOptions = { lazy: true };

                function initComputed(vm, computed) {
                    // $flow-disable-line
                    var watchers = vm._computedWatchers = Object.create(null);
                    // computed properties are just getters during SSR
                    var isSSR = isServerRendering();

                    for (var key in computed) {
                        var userDef = computed[key];
                        var getter = typeof userDef === 'function' ? userDef : userDef.get;
                        if ("development" !== 'production' && getter == null) {
                            warn(
                                ("Getter is missing for computed property \"" + key + "\"."),
                                vm
                            );
                        }

                        if (!isSSR) {
                            // create internal watcher for the computed property.
                            watchers[key] = new Watcher(
                                vm,
                                getter || noop,
                                noop,
                                computedWatcherOptions
                            );
                        }

                        // component-defined computed properties are already defined on the
                        // component prototype. We only need to define computed properties defined
                        // at instantiation here.
                        if (!(key in vm)) {
                            defineComputed(vm, key, userDef);
                        } else {
                            if (key in vm.$data) {
                                warn(("The computed property \"" + key + "\" is already defined in data."), vm);
                            } else if (vm.$options.props && key in vm.$options.props) {
                                warn(("The computed property \"" + key + "\" is already defined as a prop."), vm);
                            }
                        }
                    }
                }

                function defineComputed(
                    target,
                    key,
                    userDef
                ) {
                    var shouldCache = !isServerRendering();
                    if (typeof userDef === 'function') {
                        sharedPropertyDefinition.get = shouldCache ?
                            createComputedGetter(key) :
                            userDef;
                        sharedPropertyDefinition.set = noop;
                    } else {
                        sharedPropertyDefinition.get = userDef.get ?
                            shouldCache && userDef.cache !== false ?
                            createComputedGetter(key) :
                            userDef.get :
                            noop;
                        sharedPropertyDefinition.set = userDef.set ?
                            userDef.set :
                            noop;
                    }
                    if ("development" !== 'production' &&
                        sharedPropertyDefinition.set === noop) {
                        sharedPropertyDefinition.set = function() {
                            warn(
                                ("Computed property \"" + key + "\" was assigned to but it has no setter."),
                                this
                            );
                        };
                    }
                    Object.defineProperty(target, key, sharedPropertyDefinition);
                }

                function createComputedGetter(key) {
                    return function computedGetter() {
                        var watcher = this._computedWatchers && this._computedWatchers[key];
                        if (watcher) {
                            if (watcher.dirty) {
                                watcher.evaluate();
                            }
                            if (Dep.target) {
                                watcher.depend();
                            }
                            return watcher.value
                        }
                    }
                }

                function initMethods(vm, methods) {
                    var props = vm.$options.props;
                    for (var key in methods) {
                        {
                            if (methods[key] == null) {
                                warn(
                                    "Method \"" + key + "\" has an undefined value in the component definition. " +
                                    "Did you reference the function correctly?",
                                    vm
                                );
                            }
                            if (props && hasOwn(props, key)) {
                                warn(
                                    ("Method \"" + key + "\" has already been defined as a prop."),
                                    vm
                                );
                            }
                            if ((key in vm) && isReserved(key)) {
                                warn(
                                    "Method \"" + key + "\" conflicts with an existing Vue instance method. " +
                                    "Avoid defining component methods that start with _ or $."
                                );
                            }
                        }
                        vm[key] = methods[key] == null ? noop : bind(methods[key], vm);
                    }
                }

                function initWatch(vm, watch) {
                    for (var key in watch) {
                        var handler = watch[key];
                        if (Array.isArray(handler)) {
                            for (var i = 0; i < handler.length; i++) {
                                createWatcher(vm, key, handler[i]);
                            }
                        } else {
                            createWatcher(vm, key, handler);
                        }
                    }
                }

                function createWatcher(
                    vm,
                    expOrFn,
                    handler,
                    options
                ) {
                    if (isPlainObject(handler)) {
                        options = handler;
                        handler = handler.handler;
                    }
                    if (typeof handler === 'string') {
                        handler = vm[handler];
                    }
                    return vm.$watch(expOrFn, handler, options)
                }

                function stateMixin(Vue) {
                    // flow somehow has problems with directly declared definition object
                    // when using Object.defineProperty, so we have to procedurally build up
                    // the object here.
                    var dataDef = {};
                    dataDef.get = function() { return this._data };
                    var propsDef = {};
                    propsDef.get = function() { return this._props }; {
                        dataDef.set = function(newData) {
                            warn(
                                'Avoid replacing instance root $data. ' +
                                'Use nested data properties instead.',
                                this
                            );
                        };
                        propsDef.set = function() {
                            warn("$props is readonly.", this);
                        };
                    }
                    Object.defineProperty(Vue.prototype, '$data', dataDef);
                    Object.defineProperty(Vue.prototype, '$props', propsDef);

                    Vue.prototype.$set = set;
                    Vue.prototype.$delete = del;

                    Vue.prototype.$watch = function(
                        expOrFn,
                        cb,
                        options
                    ) {
                        var vm = this;
                        if (isPlainObject(cb)) {
                            return createWatcher(vm, expOrFn, cb, options)
                        }
                        options = options || {};
                        options.user = true;
                        var watcher = new Watcher(vm, expOrFn, cb, options);
                        if (options.immediate) {
                            cb.call(vm, watcher.value);
                        }
                        return function unwatchFn() {
                            watcher.teardown();
                        }
                    };
                }

                /*  */

                function initProvide(vm) {
                    var provide = vm.$options.provide;
                    if (provide) {
                        vm._provided = typeof provide === 'function' ?
                            provide.call(vm) :
                            provide;
                    }
                }

                function initInjections(vm) {
                    var result = resolveInject(vm.$options.inject, vm);
                    if (result) {
                        toggleObserving(false);
                        Object.keys(result).forEach(function(key) {
                            /* istanbul ignore else */
                            {
                                defineReactive(vm, key, result[key], function() {
                                    warn(
                                        "Avoid mutating an injected value directly since the changes will be " +
                                        "overwritten whenever the provided component re-renders. " +
                                        "injection being mutated: \"" + key + "\"",
                                        vm
                                    );
                                });
                            }
                        });
                        toggleObserving(true);
                    }
                }

                function resolveInject(inject, vm) {
                    if (inject) {
                        // inject is :any because flow is not smart enough to figure out cached
                        var result = Object.create(null);
                        var keys = hasSymbol ?
                            Reflect.ownKeys(inject).filter(function(key) {
                                /* istanbul ignore next */
                                return Object.getOwnPropertyDescriptor(inject, key).enumerable
                            }) :
                            Object.keys(inject);

                        for (var i = 0; i < keys.length; i++) {
                            var key = keys[i];
                            var provideKey = inject[key].from;
                            var source = vm;
                            while (source) {
                                if (source._provided && hasOwn(source._provided, provideKey)) {
                                    result[key] = source._provided[provideKey];
                                    break
                                }
                                source = source.$parent;
                            }
                            if (!source) {
                                if ('default' in inject[key]) {
                                    var provideDefault = inject[key].default;
                                    result[key] = typeof provideDefault === 'function' ?
                                        provideDefault.call(vm) :
                                        provideDefault;
                                } else {
                                    warn(("Injection \"" + key + "\" not found"), vm);
                                }
                            }
                        }
                        return result
                    }
                }

                /*  */

                /**
                 * Runtime helper for rendering v-for lists.
                 */
                function renderList(
                    val,
                    render
                ) {
                    var ret, i, l, keys, key;
                    if (Array.isArray(val) || typeof val === 'string') {
                        ret = new Array(val.length);
                        for (i = 0, l = val.length; i < l; i++) {
                            ret[i] = render(val[i], i);
                        }
                    } else if (typeof val === 'number') {
                        ret = new Array(val);
                        for (i = 0; i < val; i++) {
                            ret[i] = render(i + 1, i);
                        }
                    } else if (isObject(val)) {
                        keys = Object.keys(val);
                        ret = new Array(keys.length);
                        for (i = 0, l = keys.length; i < l; i++) {
                            key = keys[i];
                            ret[i] = render(val[key], key, i);
                        }
                    }
                    if (isDef(ret)) {
                        (ret)._isVList = true;
                    }
                    return ret
                }

                /*  */

                /**
                 * Runtime helper for rendering <slot>
                 */
                function renderSlot(
                    name,
                    fallback,
                    props,
                    bindObject
                ) {
                    var scopedSlotFn = this.$scopedSlots[name];
                    var nodes;
                    if (scopedSlotFn) { // scoped slot
                        props = props || {};
                        if (bindObject) {
                            if ("development" !== 'production' && !isObject(bindObject)) {
                                warn(
                                    'slot v-bind without argument expects an Object',
                                    this
                                );
                            }
                            props = extend(extend({}, bindObject), props);
                        }
                        nodes = scopedSlotFn(props) || fallback;
                    } else {
                        var slotNodes = this.$slots[name];
                        // warn duplicate slot usage
                        if (slotNodes) {
                            if ("development" !== 'production' && slotNodes._rendered) {
                                warn(
                                    "Duplicate presence of slot \"" + name + "\" found in the same render tree " +
                                    "- this will likely cause render errors.",
                                    this
                                );
                            }
                            slotNodes._rendered = true;
                        }
                        nodes = slotNodes || fallback;
                    }

                    var target = props && props.slot;
                    if (target) {
                        return this.$createElement('template', { slot: target }, nodes)
                    } else {
                        return nodes
                    }
                }

                /*  */

                /**
                 * Runtime helper for resolving filters
                 */
                function resolveFilter(id) {
                    return resolveAsset(this.$options, 'filters', id, true) || identity
                }

                /*  */

                function isKeyNotMatch(expect, actual) {
                    if (Array.isArray(expect)) {
                        return expect.indexOf(actual) === -1
                    } else {
                        return expect !== actual
                    }
                }

                /**
                 * Runtime helper for checking keyCodes from config.
                 * exposed as Vue.prototype._k
                 * passing in eventKeyName as last argument separately for backwards compat
                 */
                function checkKeyCodes(
                    eventKeyCode,
                    key,
                    builtInKeyCode,
                    eventKeyName,
                    builtInKeyName
                ) {
                    var mappedKeyCode = config.keyCodes[key] || builtInKeyCode;
                    if (builtInKeyName && eventKeyName && !config.keyCodes[key]) {
                        return isKeyNotMatch(builtInKeyName, eventKeyName)
                    } else if (mappedKeyCode) {
                        return isKeyNotMatch(mappedKeyCode, eventKeyCode)
                    } else if (eventKeyName) {
                        return hyphenate(eventKeyName) !== key
                    }
                }

                /*  */

                /**
                 * Runtime helper for merging v-bind="object" into a VNode's data.
                 */
                function bindObjectProps(
                    data,
                    tag,
                    value,
                    asProp,
                    isSync
                ) {
                    if (value) {
                        if (!isObject(value)) {
                            "development" !== 'production' && warn(
                                'v-bind without argument expects an Object or Array value',
                                this
                            );
                        } else {
                            if (Array.isArray(value)) {
                                value = toObject(value);
                            }
                            var hash;
                            var loop = function(key) {
                                if (
                                    key === 'class' ||
                                    key === 'style' ||
                                    isReservedAttribute(key)
                                ) {
                                    hash = data;
                                } else {
                                    var type = data.attrs && data.attrs.type;
                                    hash = asProp || config.mustUseProp(tag, type, key) ?
                                        data.domProps || (data.domProps = {}) :
                                        data.attrs || (data.attrs = {});
                                }
                                if (!(key in hash)) {
                                    hash[key] = value[key];

                                    if (isSync) {
                                        var on = data.on || (data.on = {});
                                        on[("update:" + key)] = function($event) {
                                            value[key] = $event;
                                        };
                                    }
                                }
                            };

                            for (var key in value) loop(key);
                        }
                    }
                    return data
                }

                /*  */

                /**
                 * Runtime helper for rendering static trees.
                 */
                function renderStatic(
                    index,
                    isInFor
                ) {
                    var cached = this._staticTrees || (this._staticTrees = []);
                    var tree = cached[index];
                    // if has already-rendered static tree and not inside v-for,
                    // we can reuse the same tree.
                    if (tree && !isInFor) {
                        return tree
                    }
                    // otherwise, render a fresh tree.
                    tree = cached[index] = this.$options.staticRenderFns[index].call(
                        this._renderProxy,
                        null,
                        this // for render fns generated for functional component templates
                    );
                    markStatic(tree, ("__static__" + index), false);
                    return tree
                }

                /**
                 * Runtime helper for v-once.
                 * Effectively it means marking the node as static with a unique key.
                 */
                function markOnce(
                    tree,
                    index,
                    key
                ) {
                    markStatic(tree, ("__once__" + index + (key ? ("_" + key) : "")), true);
                    return tree
                }

                function markStatic(
                    tree,
                    key,
                    isOnce
                ) {
                    if (Array.isArray(tree)) {
                        for (var i = 0; i < tree.length; i++) {
                            if (tree[i] && typeof tree[i] !== 'string') {
                                markStaticNode(tree[i], (key + "_" + i), isOnce);
                            }
                        }
                    } else {
                        markStaticNode(tree, key, isOnce);
                    }
                }

                function markStaticNode(node, key, isOnce) {
                    node.isStatic = true;
                    node.key = key;
                    node.isOnce = isOnce;
                }

                /*  */

                function bindObjectListeners(data, value) {
                    if (value) {
                        if (!isPlainObject(value)) {
                            "development" !== 'production' && warn(
                                'v-on without argument expects an Object value',
                                this
                            );
                        } else {
                            var on = data.on = data.on ? extend({}, data.on) : {};
                            for (var key in value) {
                                var existing = on[key];
                                var ours = value[key];
                                on[key] = existing ? [].concat(existing, ours) : ours;
                            }
                        }
                    }
                    return data
                }

                /*  */

                function installRenderHelpers(target) {
                    target._o = markOnce;
                    target._n = toNumber;
                    target._s = toString;
                    target._l = renderList;
                    target._t = renderSlot;
                    target._q = looseEqual;
                    target._i = looseIndexOf;
                    target._m = renderStatic;
                    target._f = resolveFilter;
                    target._k = checkKeyCodes;
                    target._b = bindObjectProps;
                    target._v = createTextVNode;
                    target._e = createEmptyVNode;
                    target._u = resolveScopedSlots;
                    target._g = bindObjectListeners;
                }

                /*  */

                function FunctionalRenderContext(
                    data,
                    props,
                    children,
                    parent,
                    Ctor
                ) {
                    var options = Ctor.options;
                    // ensure the createElement function in functional components
                    // gets a unique context - this is necessary for correct named slot check
                    var contextVm;
                    if (hasOwn(parent, '_uid')) {
                        contextVm = Object.create(parent);
                        // $flow-disable-line
                        contextVm._original = parent;
                    } else {
                        // the context vm passed in is a functional context as well.
                        // in this case we want to make sure we are able to get a hold to the
                        // real context instance.
                        contextVm = parent;
                        // $flow-disable-line
                        parent = parent._original;
                    }
                    var isCompiled = isTrue(options._compiled);
                    var needNormalization = !isCompiled;

                    this.data = data;
                    this.props = props;
                    this.children = children;
                    this.parent = parent;
                    this.listeners = data.on || emptyObject;
                    this.injections = resolveInject(options.inject, parent);
                    this.slots = function() { return resolveSlots(children, parent); };

                    // support for compiled functional template
                    if (isCompiled) {
                        // exposing $options for renderStatic()
                        this.$options = options;
                        // pre-resolve slots for renderSlot()
                        this.$slots = this.slots();
                        this.$scopedSlots = data.scopedSlots || emptyObject;
                    }

                    if (options._scopeId) {
                        this._c = function(a, b, c, d) {
                            var vnode = createElement(contextVm, a, b, c, d, needNormalization);
                            if (vnode && !Array.isArray(vnode)) {
                                vnode.fnScopeId = options._scopeId;
                                vnode.fnContext = parent;
                            }
                            return vnode
                        };
                    } else {
                        this._c = function(a, b, c, d) { return createElement(contextVm, a, b, c, d, needNormalization); };
                    }
                }

                installRenderHelpers(FunctionalRenderContext.prototype);

                function createFunctionalComponent(
                    Ctor,
                    propsData,
                    data,
                    contextVm,
                    children
                ) {
                    var options = Ctor.options;
                    var props = {};
                    var propOptions = options.props;
                    if (isDef(propOptions)) {
                        for (var key in propOptions) {
                            props[key] = validateProp(key, propOptions, propsData || emptyObject);
                        }
                    } else {
                        if (isDef(data.attrs)) { mergeProps(props, data.attrs); }
                        if (isDef(data.props)) { mergeProps(props, data.props); }
                    }

                    var renderContext = new FunctionalRenderContext(
                        data,
                        props,
                        children,
                        contextVm,
                        Ctor
                    );

                    var vnode = options.render.call(null, renderContext._c, renderContext);

                    if (vnode instanceof VNode) {
                        return cloneAndMarkFunctionalResult(vnode, data, renderContext.parent, options)
                    } else if (Array.isArray(vnode)) {
                        var vnodes = normalizeChildren(vnode) || [];
                        var res = new Array(vnodes.length);
                        for (var i = 0; i < vnodes.length; i++) {
                            res[i] = cloneAndMarkFunctionalResult(vnodes[i], data, renderContext.parent, options);
                        }
                        return res
                    }
                }

                function cloneAndMarkFunctionalResult(vnode, data, contextVm, options) {
                    // #7817 clone node before setting fnContext, otherwise if the node is reused
                    // (e.g. it was from a cached normal slot) the fnContext causes named slots
                    // that should not be matched to match.
                    var clone = cloneVNode(vnode);
                    clone.fnContext = contextVm;
                    clone.fnOptions = options;
                    if (data.slot) {
                        (clone.data || (clone.data = {})).slot = data.slot;
                    }
                    return clone
                }

                function mergeProps(to, from) {
                    for (var key in from) {
                        to[camelize(key)] = from[key];
                    }
                }

                /*  */




                // Register the component hook to weex native render engine.
                // The hook will be triggered by native, not javascript.


                // Updates the state of the component to weex native render engine.

                /*  */

                // https://github.com/Hanks10100/weex-native-directive/tree/master/component

                // listening on native callback

                /*  */

                /*  */

                // inline hooks to be invoked on component VNodes during patch
                var componentVNodeHooks = {
                    init: function init(
                        vnode,
                        hydrating,
                        parentElm,
                        refElm
                    ) {
                        if (
                            vnode.componentInstance &&
                            !vnode.componentInstance._isDestroyed &&
                            vnode.data.keepAlive
                        ) {
                            // kept-alive components, treat as a patch
                            var mountedNode = vnode; // work around flow
                            componentVNodeHooks.prepatch(mountedNode, mountedNode);
                        } else {
                            var child = vnode.componentInstance = createComponentInstanceForVnode(
                                vnode,
                                activeInstance,
                                parentElm,
                                refElm
                            );
                            child.$mount(hydrating ? vnode.elm : undefined, hydrating);
                        }
                    },

                    prepatch: function prepatch(oldVnode, vnode) {
                        var options = vnode.componentOptions;
                        var child = vnode.componentInstance = oldVnode.componentInstance;
                        updateChildComponent(
                            child,
                            options.propsData, // updated props
                            options.listeners, // updated listeners
                            vnode, // new parent vnode
                            options.children // new children
                        );
                    },

                    insert: function insert(vnode) {
                        var context = vnode.context;
                        var componentInstance = vnode.componentInstance;
                        if (!componentInstance._isMounted) {
                            componentInstance._isMounted = true;
                            callHook(componentInstance, 'mounted');
                        }
                        if (vnode.data.keepAlive) {
                            if (context._isMounted) {
                                // vue-router#1212
                                // During updates, a kept-alive component's child components may
                                // change, so directly walking the tree here may call activated hooks
                                // on incorrect children. Instead we push them into a queue which will
                                // be processed after the whole patch process ended.
                                queueActivatedComponent(componentInstance);
                            } else {
                                activateChildComponent(componentInstance, true /* direct */ );
                            }
                        }
                    },

                    destroy: function destroy(vnode) {
                        var componentInstance = vnode.componentInstance;
                        if (!componentInstance._isDestroyed) {
                            if (!vnode.data.keepAlive) {
                                componentInstance.$destroy();
                            } else {
                                deactivateChildComponent(componentInstance, true /* direct */ );
                            }
                        }
                    }
                };

                var hooksToMerge = Object.keys(componentVNodeHooks);

                function createComponent(
                    Ctor,
                    data,
                    context,
                    children,
                    tag
                ) {
                    if (isUndef(Ctor)) {
                        return
                    }

                    var baseCtor = context.$options._base;

                    // plain options object: turn it into a constructor
                    if (isObject(Ctor)) {
                        Ctor = baseCtor.extend(Ctor);
                    }

                    // if at this stage it's not a constructor or an async component factory,
                    // reject.
                    if (typeof Ctor !== 'function') {
                        {
                            warn(("Invalid Component definition: " + (String(Ctor))), context);
                        }
                        return
                    }

                    // async component
                    var asyncFactory;
                    if (isUndef(Ctor.cid)) {
                        asyncFactory = Ctor;
                        Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
                        if (Ctor === undefined) {
                            // return a placeholder node for async component, which is rendered
                            // as a comment node but preserves all the raw information for the node.
                            // the information will be used for async server-rendering and hydration.
                            return createAsyncPlaceholder(
                                asyncFactory,
                                data,
                                context,
                                children,
                                tag
                            )
                        }
                    }

                    data = data || {};

                    // resolve constructor options in case global mixins are applied after
                    // component constructor creation
                    resolveConstructorOptions(Ctor);

                    // transform component v-model data into props & events
                    if (isDef(data.model)) {
                        transformModel(Ctor.options, data);
                    }

                    // extract props
                    var propsData = extractPropsFromVNodeData(data, Ctor, tag);

                    // functional component
                    if (isTrue(Ctor.options.functional)) {
                        return createFunctionalComponent(Ctor, propsData, data, context, children)
                    }

                    // extract listeners, since these needs to be treated as
                    // child component listeners instead of DOM listeners
                    var listeners = data.on;
                    // replace with listeners with .native modifier
                    // so it gets processed during parent component patch.
                    data.on = data.nativeOn;

                    if (isTrue(Ctor.options.abstract)) {
                        // abstract components do not keep anything
                        // other than props & listeners & slot

                        // work around flow
                        var slot = data.slot;
                        data = {};
                        if (slot) {
                            data.slot = slot;
                        }
                    }

                    // install component management hooks onto the placeholder node
                    installComponentHooks(data);

                    // return a placeholder vnode
                    var name = Ctor.options.name || tag;
                    var vnode = new VNode(
                        ("vue-component-" + (Ctor.cid) + (name ? ("-" + name) : '')),
                        data, undefined, undefined, undefined, context, { Ctor: Ctor, propsData: propsData, listeners: listeners, tag: tag, children: children },
                        asyncFactory
                    );

                    // Weex specific: invoke recycle-list optimized @render function for
                    // extracting cell-slot template.
                    // https://github.com/Hanks10100/weex-native-directive/tree/master/component
                    /* istanbul ignore if */
                    return vnode
                }

                function createComponentInstanceForVnode(
                    vnode, // we know it's MountedComponentVNode but flow doesn't
                    parent, // activeInstance in lifecycle state
                    parentElm,
                    refElm
                ) {
                    var options = {
                        _isComponent: true,
                        parent: parent,
                        _parentVnode: vnode,
                        _parentElm: parentElm || null,
                        _refElm: refElm || null
                    };
                    // check inline-template render functions
                    var inlineTemplate = vnode.data.inlineTemplate;
                    if (isDef(inlineTemplate)) {
                        options.render = inlineTemplate.render;
                        options.staticRenderFns = inlineTemplate.staticRenderFns;
                    }
                    return new vnode.componentOptions.Ctor(options)
                }

                function installComponentHooks(data) {
                    var hooks = data.hook || (data.hook = {});
                    for (var i = 0; i < hooksToMerge.length; i++) {
                        var key = hooksToMerge[i];
                        hooks[key] = componentVNodeHooks[key];
                    }
                }

                // transform component v-model info (value and callback) into
                // prop and event handler respectively.
                function transformModel(options, data) {
                    var prop = (options.model && options.model.prop) || 'value';
                    var event = (options.model && options.model.event) || 'input';
                    (data.props || (data.props = {}))[prop] = data.model.value;
                    var on = data.on || (data.on = {});
                    if (isDef(on[event])) {
                        on[event] = [data.model.callback].concat(on[event]);
                    } else {
                        on[event] = data.model.callback;
                    }
                }

                /*  */

                var SIMPLE_NORMALIZE = 1;
                var ALWAYS_NORMALIZE = 2;

                // wrapper function for providing a more flexible interface
                // without getting yelled at by flow
                function createElement(
                    context,
                    tag,
                    data,
                    children,
                    normalizationType,
                    alwaysNormalize
                ) {
                    if (Array.isArray(data) || isPrimitive(data)) {
                        normalizationType = children;
                        children = data;
                        data = undefined;
                    }
                    if (isTrue(alwaysNormalize)) {
                        normalizationType = ALWAYS_NORMALIZE;
                    }
                    return _createElement(context, tag, data, children, normalizationType)
                }

                function _createElement(
                    context,
                    tag,
                    data,
                    children,
                    normalizationType
                ) {
                    if (isDef(data) && isDef((data).__ob__)) {
                        "development" !== 'production' && warn(
                            "Avoid using observed data object as vnode data: " + (JSON.stringify(data)) + "\n" +
                            'Always create fresh vnode data objects in each render!',
                            context
                        );
                        return createEmptyVNode()
                    }
                    // object syntax in v-bind
                    if (isDef(data) && isDef(data.is)) {
                        tag = data.is;
                    }
                    if (!tag) {
                        // in case of component :is set to falsy value
                        return createEmptyVNode()
                    }
                    // warn against non-primitive key
                    if ("development" !== 'production' &&
                        isDef(data) && isDef(data.key) && !isPrimitive(data.key)
                    ) {
                        {
                            warn(
                                'Avoid using non-primitive value as key, ' +
                                'use string/number value instead.',
                                context
                            );
                        }
                    }
                    // support single function children as default scoped slot
                    if (Array.isArray(children) &&
                        typeof children[0] === 'function'
                    ) {
                        data = data || {};
                        data.scopedSlots = { default: children[0] };
                        children.length = 0;
                    }
                    if (normalizationType === ALWAYS_NORMALIZE) {
                        children = normalizeChildren(children);
                    } else if (normalizationType === SIMPLE_NORMALIZE) {
                        children = simpleNormalizeChildren(children);
                    }
                    var vnode, ns;
                    if (typeof tag === 'string') {
                        var Ctor;
                        ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
                        if (config.isReservedTag(tag)) {
                            // platform built-in elements
                            vnode = new VNode(
                                config.parsePlatformTagName(tag), data, children,
                                undefined, undefined, context
                            );
                        } else if (isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
                            // component
                            vnode = createComponent(Ctor, data, context, children, tag);
                        } else {
                            // unknown or unlisted namespaced elements
                            // check at runtime because it may get assigned a namespace when its
                            // parent normalizes children
                            vnode = new VNode(
                                tag, data, children,
                                undefined, undefined, context
                            );
                        }
                    } else {
                        // direct component options / constructor
                        vnode = createComponent(tag, data, context, children);
                    }
                    if (Array.isArray(vnode)) {
                        return vnode
                    } else if (isDef(vnode)) {
                        if (isDef(ns)) { applyNS(vnode, ns); }
                        if (isDef(data)) { registerDeepBindings(data); }
                        return vnode
                    } else {
                        return createEmptyVNode()
                    }
                }

                function applyNS(vnode, ns, force) {
                    vnode.ns = ns;
                    if (vnode.tag === 'foreignObject') {
                        // use default namespace inside foreignObject
                        ns = undefined;
                        force = true;
                    }
                    if (isDef(vnode.children)) {
                        for (var i = 0, l = vnode.children.length; i < l; i++) {
                            var child = vnode.children[i];
                            if (isDef(child.tag) && (
                                    isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) {
                                applyNS(child, ns, force);
                            }
                        }
                    }
                }

                // ref #5318
                // necessary to ensure parent re-render when deep bindings like :style and
                // :class are used on slot nodes
                function registerDeepBindings(data) {
                    if (isObject(data.style)) {
                        traverse(data.style);
                    }
                    if (isObject(data.class)) {
                        traverse(data.class);
                    }
                }

                /*  */

                function initRender(vm) {
                    vm._vnode = null; // the root of the child tree
                    vm._staticTrees = null; // v-once cached trees
                    var options = vm.$options;
                    var parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
                    var renderContext = parentVnode && parentVnode.context;
                    vm.$slots = resolveSlots(options._renderChildren, renderContext);
                    vm.$scopedSlots = emptyObject;
                    // bind the createElement fn to this instance
                    // so that we get proper render context inside it.
                    // args order: tag, data, children, normalizationType, alwaysNormalize
                    // internal version is used by render functions compiled from templates
                    vm._c = function(a, b, c, d) { return createElement(vm, a, b, c, d, false); };
                    // normalization is always applied for the public version, used in
                    // user-written render functions.
                    vm.$createElement = function(a, b, c, d) { return createElement(vm, a, b, c, d, true); };

                    // $attrs & $listeners are exposed for easier HOC creation.
                    // they need to be reactive so that HOCs using them are always updated
                    var parentData = parentVnode && parentVnode.data;

                    /* istanbul ignore else */
                    {
                        defineReactive(vm, '$attrs', parentData && parentData.attrs || emptyObject, function() {
                            !isUpdatingChildComponent && warn("$attrs is readonly.", vm);
                        }, true);
                        defineReactive(vm, '$listeners', options._parentListeners || emptyObject, function() {
                            !isUpdatingChildComponent && warn("$listeners is readonly.", vm);
                        }, true);
                    }
                }

                function renderMixin(Vue) {
                    // install runtime convenience helpers
                    installRenderHelpers(Vue.prototype);

                    Vue.prototype.$nextTick = function(fn) {
                        return nextTick(fn, this)
                    };

                    Vue.prototype._render = function() {
                        var vm = this;
                        var ref = vm.$options;
                        var render = ref.render;
                        var _parentVnode = ref._parentVnode;

                        // reset _rendered flag on slots for duplicate slot check
                        {
                            for (var key in vm.$slots) {
                                // $flow-disable-line
                                vm.$slots[key]._rendered = false;
                            }
                        }

                        if (_parentVnode) {
                            vm.$scopedSlots = _parentVnode.data.scopedSlots || emptyObject;
                        }

                        // set parent vnode. this allows render functions to have access
                        // to the data on the placeholder node.
                        vm.$vnode = _parentVnode;
                        // render self
                        var vnode;
                        try {
                            vnode = render.call(vm._renderProxy, vm.$createElement);
                        } catch (e) {
                            handleError(e, vm, "render");
                            // return error render result,
                            // or previous vnode to prevent render error causing blank component
                            /* istanbul ignore else */
                            {
                                if (vm.$options.renderError) {
                                    try {
                                        vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
                                    } catch (e) {
                                        handleError(e, vm, "renderError");
                                        vnode = vm._vnode;
                                    }
                                } else {
                                    vnode = vm._vnode;
                                }
                            }
                        }
                        // return empty vnode in case the render function errored out
                        if (!(vnode instanceof VNode)) {
                            if ("development" !== 'production' && Array.isArray(vnode)) {
                                warn(
                                    'Multiple root nodes returned from render function. Render function ' +
                                    'should return a single root node.',
                                    vm
                                );
                            }
                            vnode = createEmptyVNode();
                        }
                        // set parent
                        vnode.parent = _parentVnode;
                        return vnode
                    };
                }

                /*  */

                var uid$3 = 0;

                function initMixin(Vue) {
                    Vue.prototype._init = function(options) {
                        var vm = this;
                        // a uid
                        vm._uid = uid$3++;

                        var startTag, endTag;
                        /* istanbul ignore if */
                        if ("development" !== 'production' && config.performance && mark) {
                            startTag = "vue-perf-start:" + (vm._uid);
                            endTag = "vue-perf-end:" + (vm._uid);
                            mark(startTag);
                        }

                        // a flag to avoid this being observed
                        vm._isVue = true;
                        // merge options
                        if (options && options._isComponent) {
                            // optimize internal component instantiation
                            // since dynamic options merging is pretty slow, and none of the
                            // internal component options needs special treatment.
                            initInternalComponent(vm, options);
                        } else {
                            vm.$options = mergeOptions(
                                resolveConstructorOptions(vm.constructor),
                                options || {},
                                vm
                            );
                        }
                        /* istanbul ignore else */
                        {
                            initProxy(vm);
                        }
                        // expose real self
                        vm._self = vm;
                        initLifecycle(vm);
                        initEvents(vm);
                        initRender(vm);
                        callHook(vm, 'beforeCreate');
                        initInjections(vm); // resolve injections before data/props
                        initState(vm);
                        initProvide(vm); // resolve provide after data/props
                        callHook(vm, 'created');

                        /* istanbul ignore if */
                        if ("development" !== 'production' && config.performance && mark) {
                            vm._name = formatComponentName(vm, false);
                            mark(endTag);
                            measure(("vue " + (vm._name) + " init"), startTag, endTag);
                        }

                        if (vm.$options.el) {
                            vm.$mount(vm.$options.el);
                        }
                    };
                }

                function initInternalComponent(vm, options) {
                    var opts = vm.$options = Object.create(vm.constructor.options);
                    // doing this because it's faster than dynamic enumeration.
                    var parentVnode = options._parentVnode;
                    opts.parent = options.parent;
                    opts._parentVnode = parentVnode;
                    opts._parentElm = options._parentElm;
                    opts._refElm = options._refElm;

                    var vnodeComponentOptions = parentVnode.componentOptions;
                    opts.propsData = vnodeComponentOptions.propsData;
                    opts._parentListeners = vnodeComponentOptions.listeners;
                    opts._renderChildren = vnodeComponentOptions.children;
                    opts._componentTag = vnodeComponentOptions.tag;

                    if (options.render) {
                        opts.render = options.render;
                        opts.staticRenderFns = options.staticRenderFns;
                    }
                }

                function resolveConstructorOptions(Ctor) {
                    var options = Ctor.options;
                    if (Ctor.super) {
                        var superOptions = resolveConstructorOptions(Ctor.super);
                        var cachedSuperOptions = Ctor.superOptions;
                        if (superOptions !== cachedSuperOptions) {
                            // super option changed,
                            // need to resolve new options.
                            Ctor.superOptions = superOptions;
                            // check if there are any late-modified/attached options (#4976)
                            var modifiedOptions = resolveModifiedOptions(Ctor);
                            // update base extend options
                            if (modifiedOptions) {
                                extend(Ctor.extendOptions, modifiedOptions);
                            }
                            options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions);
                            if (options.name) {
                                options.components[options.name] = Ctor;
                            }
                        }
                    }
                    return options
                }

                function resolveModifiedOptions(Ctor) {
                    var modified;
                    var latest = Ctor.options;
                    var extended = Ctor.extendOptions;
                    var sealed = Ctor.sealedOptions;
                    for (var key in latest) {
                        if (latest[key] !== sealed[key]) {
                            if (!modified) { modified = {}; }
                            modified[key] = dedupe(latest[key], extended[key], sealed[key]);
                        }
                    }
                    return modified
                }

                function dedupe(latest, extended, sealed) {
                    // compare latest and sealed to ensure lifecycle hooks won't be duplicated
                    // between merges
                    if (Array.isArray(latest)) {
                        var res = [];
                        sealed = Array.isArray(sealed) ? sealed : [sealed];
                        extended = Array.isArray(extended) ? extended : [extended];
                        for (var i = 0; i < latest.length; i++) {
                            // push original options and not sealed options to exclude duplicated options
                            if (extended.indexOf(latest[i]) >= 0 || sealed.indexOf(latest[i]) < 0) {
                                res.push(latest[i]);
                            }
                        }
                        return res
                    } else {
                        return latest
                    }
                }

                function Vue(options) {
                    if ("development" !== 'production' &&
                        !(this instanceof Vue)
                    ) {
                        warn('Vue is a constructor and should be called with the `new` keyword');
                    }
                    this._init(options);
                }

                initMixin(Vue);
                stateMixin(Vue);
                eventsMixin(Vue);
                lifecycleMixin(Vue);
                renderMixin(Vue);

                /*  */

                function initUse(Vue) {
                    Vue.use = function(plugin) {
                        var installedPlugins = (this._installedPlugins || (this._installedPlugins = []));
                        if (installedPlugins.indexOf(plugin) > -1) {
                            return this
                        }

                        // additional parameters
                        var args = toArray(arguments, 1);
                        args.unshift(this);
                        if (typeof plugin.install === 'function') {
                            plugin.install.apply(plugin, args);
                        } else if (typeof plugin === 'function') {
                            plugin.apply(null, args);
                        }
                        installedPlugins.push(plugin);
                        return this
                    };
                }

                /*  */

                function initMixin$1(Vue) {
                    Vue.mixin = function(mixin) {
                        this.options = mergeOptions(this.options, mixin);
                        return this
                    };
                }

                /*  */

                function initExtend(Vue) {
                    /**
                     * Each instance constructor, including Vue, has a unique
                     * cid. This enables us to create wrapped "child
                     * constructors" for prototypal inheritance and cache them.
                     */
                    Vue.cid = 0;
                    var cid = 1;

                    /**
                     * Class inheritance
                     */
                    Vue.extend = function(extendOptions) {
                        extendOptions = extendOptions || {};
                        var Super = this;
                        var SuperId = Super.cid;
                        var cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});
                        if (cachedCtors[SuperId]) {
                            return cachedCtors[SuperId]
                        }

                        var name = extendOptions.name || Super.options.name;
                        if ("development" !== 'production' && name) {
                            validateComponentName(name);
                        }

                        var Sub = function VueComponent(options) {
                            this._init(options);
                        };
                        Sub.prototype = Object.create(Super.prototype);
                        Sub.prototype.constructor = Sub;
                        Sub.cid = cid++;
                        Sub.options = mergeOptions(
                            Super.options,
                            extendOptions
                        );
                        Sub['super'] = Super;

                        // For props and computed properties, we define the proxy getters on
                        // the Vue instances at extension time, on the extended prototype. This
                        // avoids Object.defineProperty calls for each instance created.
                        if (Sub.options.props) {
                            initProps$1(Sub);
                        }
                        if (Sub.options.computed) {
                            initComputed$1(Sub);
                        }

                        // allow further extension/mixin/plugin usage
                        Sub.extend = Super.extend;
                        Sub.mixin = Super.mixin;
                        Sub.use = Super.use;

                        // create asset registers, so extended classes
                        // can have their private assets too.
                        ASSET_TYPES.forEach(function(type) {
                            Sub[type] = Super[type];
                        });
                        // enable recursive self-lookup
                        if (name) {
                            Sub.options.components[name] = Sub;
                        }

                        // keep a reference to the super options at extension time.
                        // later at instantiation we can check if Super's options have
                        // been updated.
                        Sub.superOptions = Super.options;
                        Sub.extendOptions = extendOptions;
                        Sub.sealedOptions = extend({}, Sub.options);

                        // cache constructor
                        cachedCtors[SuperId] = Sub;
                        return Sub
                    };
                }

                function initProps$1(Comp) {
                    var props = Comp.options.props;
                    for (var key in props) {
                        proxy(Comp.prototype, "_props", key);
                    }
                }

                function initComputed$1(Comp) {
                    var computed = Comp.options.computed;
                    for (var key in computed) {
                        defineComputed(Comp.prototype, key, computed[key]);
                    }
                }

                /*  */

                function initAssetRegisters(Vue) {
                    /**
                     * Create asset registration methods.
                     */
                    ASSET_TYPES.forEach(function(type) {
                        Vue[type] = function(
                            id,
                            definition
                        ) {
                            if (!definition) {
                                return this.options[type + 's'][id]
                            } else {
                                /* istanbul ignore if */
                                if ("development" !== 'production' && type === 'component') {
                                    validateComponentName(id);
                                }
                                if (type === 'component' && isPlainObject(definition)) {
                                    definition.name = definition.name || id;
                                    definition = this.options._base.extend(definition);
                                }
                                if (type === 'directive' && typeof definition === 'function') {
                                    definition = { bind: definition, update: definition };
                                }
                                this.options[type + 's'][id] = definition;
                                return definition
                            }
                        };
                    });
                }

                /*  */

                function getComponentName(opts) {
                    return opts && (opts.Ctor.options.name || opts.tag)
                }

                function matches(pattern, name) {
                    if (Array.isArray(pattern)) {
                        return pattern.indexOf(name) > -1
                    } else if (typeof pattern === 'string') {
                        return pattern.split(',').indexOf(name) > -1
                    } else if (isRegExp(pattern)) {
                        return pattern.test(name)
                    }
                    /* istanbul ignore next */
                    return false
                }

                function pruneCache(keepAliveInstance, filter) {
                    var cache = keepAliveInstance.cache;
                    var keys = keepAliveInstance.keys;
                    var _vnode = keepAliveInstance._vnode;
                    for (var key in cache) {
                        var cachedNode = cache[key];
                        if (cachedNode) {
                            var name = getComponentName(cachedNode.componentOptions);
                            if (name && !filter(name)) {
                                pruneCacheEntry(cache, key, keys, _vnode);
                            }
                        }
                    }
                }

                function pruneCacheEntry(
                    cache,
                    key,
                    keys,
                    current
                ) {
                    var cached$$1 = cache[key];
                    if (cached$$1 && (!current || cached$$1.tag !== current.tag)) {
                        cached$$1.componentInstance.$destroy();
                    }
                    cache[key] = null;
                    remove(keys, key);
                }

                var patternTypes = [String, RegExp, Array];

                var KeepAlive = {
                    name: 'keep-alive',
                    abstract: true,

                    props: {
                        include: patternTypes,
                        exclude: patternTypes,
                        max: [String, Number]
                    },

                    created: function created() {
                        this.cache = Object.create(null);
                        this.keys = [];
                    },

                    destroyed: function destroyed() {
                        var this$1 = this;

                        for (var key in this$1.cache) {
                            pruneCacheEntry(this$1.cache, key, this$1.keys);
                        }
                    },

                    mounted: function mounted() {
                        var this$1 = this;

                        this.$watch('include', function(val) {
                            pruneCache(this$1, function(name) { return matches(val, name); });
                        });
                        this.$watch('exclude', function(val) {
                            pruneCache(this$1, function(name) { return !matches(val, name); });
                        });
                    },

                    render: function render() {
                        var slot = this.$slots.default;
                        var vnode = getFirstComponentChild(slot);
                        var componentOptions = vnode && vnode.componentOptions;
                        if (componentOptions) {
                            // check pattern
                            var name = getComponentName(componentOptions);
                            var ref = this;
                            var include = ref.include;
                            var exclude = ref.exclude;
                            if (
                                // not included
                                (include && (!name || !matches(include, name))) ||
                                // excluded
                                (exclude && name && matches(exclude, name))
                            ) {
                                return vnode
                            }

                            var ref$1 = this;
                            var cache = ref$1.cache;
                            var keys = ref$1.keys;
                            var key = vnode.key == null
                                // same constructor may get registered as different local components
                                // so cid alone is not enough (#3269)
                                ?
                                componentOptions.Ctor.cid + (componentOptions.tag ? ("::" + (componentOptions.tag)) : '') :
                                vnode.key;
                            if (cache[key]) {
                                vnode.componentInstance = cache[key].componentInstance;
                                // make current key freshest
                                remove(keys, key);
                                keys.push(key);
                            } else {
                                cache[key] = vnode;
                                keys.push(key);
                                // prune oldest entry
                                if (this.max && keys.length > parseInt(this.max)) {
                                    pruneCacheEntry(cache, keys[0], keys, this._vnode);
                                }
                            }

                            vnode.data.keepAlive = true;
                        }
                        return vnode || (slot && slot[0])
                    }
                }

                var builtInComponents = {
                    KeepAlive: KeepAlive
                }

                /*  */

                function initGlobalAPI(Vue) {
                    // config
                    var configDef = {};
                    configDef.get = function() { return config; }; {
                        configDef.set = function() {
                            warn(
                                'Do not replace the Vue.config object, set individual fields instead.'
                            );
                        };
                    }
                    Object.defineProperty(Vue, 'config', configDef);

                    // exposed util methods.
                    // NOTE: these are not considered part of the public API - avoid relying on
                    // them unless you are aware of the risk.
                    Vue.util = {
                        warn: warn,
                        extend: extend,
                        mergeOptions: mergeOptions,
                        defineReactive: defineReactive
                    };

                    Vue.set = set;
                    Vue.delete = del;
                    Vue.nextTick = nextTick;

                    Vue.options = Object.create(null);
                    ASSET_TYPES.forEach(function(type) {
                        Vue.options[type + 's'] = Object.create(null);
                    });

                    // this is used to identify the "base" constructor to extend all plain-object
                    // components with in Weex's multi-instance scenarios.
                    Vue.options._base = Vue;

                    extend(Vue.options.components, builtInComponents);

                    initUse(Vue);
                    initMixin$1(Vue);
                    initExtend(Vue);
                    initAssetRegisters(Vue);
                }

                initGlobalAPI(Vue);

                Object.defineProperty(Vue.prototype, '$isServer', {
                    get: isServerRendering
                });

                Object.defineProperty(Vue.prototype, '$ssrContext', {
                    get: function get() {
                        /* istanbul ignore next */
                        return this.$vnode && this.$vnode.ssrContext
                    }
                });

                // expose FunctionalRenderContext for ssr runtime helper installation
                Object.defineProperty(Vue, 'FunctionalRenderContext', {
                    value: FunctionalRenderContext
                });

                Vue.version = '2.5.17';

                /*  */

                // these are reserved for web because they are directly compiled away
                // during template compilation
                var isReservedAttr = makeMap('style,class');

                // attributes that should be using props for binding
                var acceptValue = makeMap('input,textarea,option,select,progress');
                var mustUseProp = function(tag, type, attr) {
                    return (
                        (attr === 'value' && acceptValue(tag)) && type !== 'button' ||
                        (attr === 'selected' && tag === 'option') ||
                        (attr === 'checked' && tag === 'input') ||
                        (attr === 'muted' && tag === 'video')
                    )
                };

                var isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck');

                var isBooleanAttr = makeMap(
                    'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
                    'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
                    'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
                    'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
                    'required,reversed,scoped,seamless,selected,sortable,translate,' +
                    'truespeed,typemustmatch,visible'
                );

                var xlinkNS = 'http://www.w3.org/1999/xlink';

                var isXlink = function(name) {
                    return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
                };

                var getXlinkProp = function(name) {
                    return isXlink(name) ? name.slice(6, name.length) : ''
                };

                var isFalsyAttrValue = function(val) {
                    return val == null || val === false
                };

                /*  */

                function genClassForVnode(vnode) {
                    var data = vnode.data;
                    var parentNode = vnode;
                    var childNode = vnode;
                    while (isDef(childNode.componentInstance)) {
                        childNode = childNode.componentInstance._vnode;
                        if (childNode && childNode.data) {
                            data = mergeClassData(childNode.data, data);
                        }
                    }
                    while (isDef(parentNode = parentNode.parent)) {
                        if (parentNode && parentNode.data) {
                            data = mergeClassData(data, parentNode.data);
                        }
                    }
                    return renderClass(data.staticClass, data.class)
                }

                function mergeClassData(child, parent) {
                    return {
                        staticClass: concat(child.staticClass, parent.staticClass),
                        class: isDef(child.class) ?
                            [child.class, parent.class] :
                            parent.class
                    }
                }

                function renderClass(
                    staticClass,
                    dynamicClass
                ) {
                    if (isDef(staticClass) || isDef(dynamicClass)) {
                        return concat(staticClass, stringifyClass(dynamicClass))
                    }
                    /* istanbul ignore next */
                    return ''
                }

                function concat(a, b) {
                    return a ? b ? (a + ' ' + b) : a : (b || '')
                }

                function stringifyClass(value) {
                    if (Array.isArray(value)) {
                        return stringifyArray(value)
                    }
                    if (isObject(value)) {
                        return stringifyObject(value)
                    }
                    if (typeof value === 'string') {
                        return value
                    }
                    /* istanbul ignore next */
                    return ''
                }

                function stringifyArray(value) {
                    var res = '';
                    var stringified;
                    for (var i = 0, l = value.length; i < l; i++) {
                        if (isDef(stringified = stringifyClass(value[i])) && stringified !== '') {
                            if (res) { res += ' '; }
                            res += stringified;
                        }
                    }
                    return res
                }

                function stringifyObject(value) {
                    var res = '';
                    for (var key in value) {
                        if (value[key]) {
                            if (res) { res += ' '; }
                            res += key;
                        }
                    }
                    return res
                }

                /*  */

                var namespaceMap = {
                    svg: 'http://www.w3.org/2000/svg',
                    math: 'http://www.w3.org/1998/Math/MathML'
                };

                var isHTMLTag = makeMap(
                    'html,body,base,head,link,meta,style,title,' +
                    'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
                    'div,dd,dl,dt,figcaption,figure,picture,hr,img,li,main,ol,p,pre,ul,' +
                    'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
                    's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
                    'embed,object,param,source,canvas,script,noscript,del,ins,' +
                    'caption,col,colgroup,table,thead,tbody,td,th,tr,' +
                    'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +
                    'output,progress,select,textarea,' +
                    'details,dialog,menu,menuitem,summary,' +
                    'content,element,shadow,template,blockquote,iframe,tfoot'
                );

                // this map is intentionally selective, only covering SVG elements that may
                // contain child elements.
                var isSVG = makeMap(
                    'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font-face,' +
                    'foreignObject,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +
                    'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',
                    true
                );

                var isPreTag = function(tag) { return tag === 'pre'; };

                var isReservedTag = function(tag) {
                    return isHTMLTag(tag) || isSVG(tag)
                };

                function getTagNamespace(tag) {
                    if (isSVG(tag)) {
                        return 'svg'
                    }
                    // basic support for MathML
                    // note it doesn't support other MathML elements being component roots
                    if (tag === 'math') {
                        return 'math'
                    }
                }

                var unknownElementCache = Object.create(null);

                function isUnknownElement(tag) {
                    /* istanbul ignore if */
                    if (!inBrowser) {
                        return true
                    }
                    if (isReservedTag(tag)) {
                        return false
                    }
                    tag = tag.toLowerCase();
                    /* istanbul ignore if */
                    if (unknownElementCache[tag] != null) {
                        return unknownElementCache[tag]
                    }
                    var el = document.createElement(tag);
                    if (tag.indexOf('-') > -1) {
                        // http://stackoverflow.com/a/28210364/1070244
                        return (unknownElementCache[tag] = (
                            el.constructor === window.HTMLUnknownElement ||
                            el.constructor === window.HTMLElement
                        ))
                    } else {
                        return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))
                    }
                }

                var isTextInputType = makeMap('text,number,password,search,email,tel,url');

                /*  */

                /**
                 * Query an element selector if it's not an element already.
                 */
                function query(el) {
                    if (typeof el === 'string') {
                        var selected = document.querySelector(el);
                        if (!selected) {
                            "development" !== 'production' && warn(
                                'Cannot find element: ' + el
                            );
                            return document.createElement('div')
                        }
                        return selected
                    } else {
                        return el
                    }
                }

                /*  */

                function createElement$1(tagName, vnode) {
                    var elm = document.createElement(tagName);
                    if (tagName !== 'select') {
                        return elm
                    }
                    // false or null will remove the attribute but undefined will not
                    if (vnode.data && vnode.data.attrs && vnode.data.attrs.multiple !== undefined) {
                        elm.setAttribute('multiple', 'multiple');
                    }
                    return elm
                }

                function createElementNS(namespace, tagName) {
                    return document.createElementNS(namespaceMap[namespace], tagName)
                }

                function createTextNode(text) {
                    return document.createTextNode(text)
                }

                function createComment(text) {
                    return document.createComment(text)
                }

                function insertBefore(parentNode, newNode, referenceNode) {
                    parentNode.insertBefore(newNode, referenceNode);
                }

                function removeChild(node, child) {
                    node.removeChild(child);
                }

                function appendChild(node, child) {
                    node.appendChild(child);
                }

                function parentNode(node) {
                    return node.parentNode
                }

                function nextSibling(node) {
                    return node.nextSibling
                }

                function tagName(node) {
                    return node.tagName
                }

                function setTextContent(node, text) {
                    node.textContent = text;
                }

                function setStyleScope(node, scopeId) {
                    node.setAttribute(scopeId, '');
                }


                var nodeOps = Object.freeze({
                    createElement: createElement$1,
                    createElementNS: createElementNS,
                    createTextNode: createTextNode,
                    createComment: createComment,
                    insertBefore: insertBefore,
                    removeChild: removeChild,
                    appendChild: appendChild,
                    parentNode: parentNode,
                    nextSibling: nextSibling,
                    tagName: tagName,
                    setTextContent: setTextContent,
                    setStyleScope: setStyleScope
                });

                /*  */

                var ref = {
                    create: function create(_, vnode) {
                        registerRef(vnode);
                    },
                    update: function update(oldVnode, vnode) {
                        if (oldVnode.data.ref !== vnode.data.ref) {
                            registerRef(oldVnode, true);
                            registerRef(vnode);
                        }
                    },
                    destroy: function destroy(vnode) {
                        registerRef(vnode, true);
                    }
                }

                function registerRef(vnode, isRemoval) {
                    var key = vnode.data.ref;
                    if (!isDef(key)) { return }

                    var vm = vnode.context;
                    var ref = vnode.componentInstance || vnode.elm;
                    var refs = vm.$refs;
                    if (isRemoval) {
                        if (Array.isArray(refs[key])) {
                            remove(refs[key], ref);
                        } else if (refs[key] === ref) {
                            refs[key] = undefined;
                        }
                    } else {
                        if (vnode.data.refInFor) {
                            if (!Array.isArray(refs[key])) {
                                refs[key] = [ref];
                            } else if (refs[key].indexOf(ref) < 0) {
                                // $flow-disable-line
                                refs[key].push(ref);
                            }
                        } else {
                            refs[key] = ref;
                        }
                    }
                }

                /**
                 * Virtual DOM patching algorithm based on Snabbdom by
                 * Simon Friis Vindum (@paldepind)
                 * Licensed under the MIT License
                 * https://github.com/paldepind/snabbdom/blob/master/LICENSE
                 *
                 * modified by Evan You (@yyx990803)
                 *
                 * Not type-checking this because this file is perf-critical and the cost
                 * of making flow understand it is not worth it.
                 */

                var emptyNode = new VNode('', {}, []);

                var hooks = ['create', 'activate', 'update', 'remove', 'destroy'];

                function sameVnode(a, b) {
                    return (
                        a.key === b.key && (
                            (
                                a.tag === b.tag &&
                                a.isComment === b.isComment &&
                                isDef(a.data) === isDef(b.data) &&
                                sameInputType(a, b)
                            ) || (
                                isTrue(a.isAsyncPlaceholder) &&
                                a.asyncFactory === b.asyncFactory &&
                                isUndef(b.asyncFactory.error)
                            )
                        )
                    )
                }

                function sameInputType(a, b) {
                    if (a.tag !== 'input') { return true }
                    var i;
                    var typeA = isDef(i = a.data) && isDef(i = i.attrs) && i.type;
                    var typeB = isDef(i = b.data) && isDef(i = i.attrs) && i.type;
                    return typeA === typeB || isTextInputType(typeA) && isTextInputType(typeB)
                }

                function createKeyToOldIdx(children, beginIdx, endIdx) {
                    var i, key;
                    var map = {};
                    for (i = beginIdx; i <= endIdx; ++i) {
                        key = children[i].key;
                        if (isDef(key)) { map[key] = i; }
                    }
                    return map
                }

                function createPatchFunction(backend) {
                    var i, j;
                    var cbs = {};

                    var modules = backend.modules;
                    var nodeOps = backend.nodeOps;

                    for (i = 0; i < hooks.length; ++i) {
                        cbs[hooks[i]] = [];
                        for (j = 0; j < modules.length; ++j) {
                            if (isDef(modules[j][hooks[i]])) {
                                cbs[hooks[i]].push(modules[j][hooks[i]]);
                            }
                        }
                    }

                    function emptyNodeAt(elm) {
                        return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
                    }

                    function createRmCb(childElm, listeners) {
                        function remove() {
                            if (--remove.listeners === 0) {
                                removeNode(childElm);
                            }
                        }
                        remove.listeners = listeners;
                        return remove
                    }

                    function removeNode(el) {
                        var parent = nodeOps.parentNode(el);
                        // element may have already been removed due to v-html / v-text
                        if (isDef(parent)) {
                            nodeOps.removeChild(parent, el);
                        }
                    }

                    function isUnknownElement$$1(vnode, inVPre) {
                        return (!inVPre &&
                            !vnode.ns &&
                            !(
                                config.ignoredElements.length &&
                                config.ignoredElements.some(function(ignore) {
                                    return isRegExp(ignore) ?
                                        ignore.test(vnode.tag) :
                                        ignore === vnode.tag
                                })
                            ) &&
                            config.isUnknownElement(vnode.tag)
                        )
                    }

                    var creatingElmInVPre = 0;

                    function createElm(
                        vnode,
                        insertedVnodeQueue,
                        parentElm,
                        refElm,
                        nested,
                        ownerArray,
                        index
                    ) {
                        if (isDef(vnode.elm) && isDef(ownerArray)) {
                            // This vnode was used in a previous render!
                            // now it's used as a new node, overwriting its elm would cause
                            // potential patch errors down the road when it's used as an insertion
                            // reference node. Instead, we clone the node on-demand before creating
                            // associated DOM element for it.
                            vnode = ownerArray[index] = cloneVNode(vnode);
                        }

                        vnode.isRootInsert = !nested; // for transition enter check
                        if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
                            return
                        }

                        var data = vnode.data;
                        var children = vnode.children;
                        var tag = vnode.tag;
                        if (isDef(tag)) {
                            {
                                if (data && data.pre) {
                                    creatingElmInVPre++;
                                }
                                if (isUnknownElement$$1(vnode, creatingElmInVPre)) {
                                    warn(
                                        'Unknown custom element: <' + tag + '> - did you ' +
                                        'register the component correctly? For recursive components, ' +
                                        'make sure to provide the "name" option.',
                                        vnode.context
                                    );
                                }
                            }

                            vnode.elm = vnode.ns ?
                                nodeOps.createElementNS(vnode.ns, tag) :
                                nodeOps.createElement(tag, vnode);
                            setScope(vnode);

                            /* istanbul ignore if */
                            {
                                createChildren(vnode, children, insertedVnodeQueue);
                                if (isDef(data)) {
                                    invokeCreateHooks(vnode, insertedVnodeQueue);
                                }
                                insert(parentElm, vnode.elm, refElm);
                            }

                            if ("development" !== 'production' && data && data.pre) {
                                creatingElmInVPre--;
                            }
                        } else if (isTrue(vnode.isComment)) {
                            vnode.elm = nodeOps.createComment(vnode.text);
                            insert(parentElm, vnode.elm, refElm);
                        } else {
                            vnode.elm = nodeOps.createTextNode(vnode.text);
                            insert(parentElm, vnode.elm, refElm);
                        }
                    }

                    function createComponent(vnode, insertedVnodeQueue, parentElm, refElm) {
                        var i = vnode.data;
                        if (isDef(i)) {
                            var isReactivated = isDef(vnode.componentInstance) && i.keepAlive;
                            if (isDef(i = i.hook) && isDef(i = i.init)) {
                                i(vnode, false /* hydrating */ , parentElm, refElm);
                            }
                            // after calling the init hook, if the vnode is a child component
                            // it should've created a child instance and mounted it. the child
                            // component also has set the placeholder vnode's elm.
                            // in that case we can just return the element and be done.
                            if (isDef(vnode.componentInstance)) {
                                initComponent(vnode, insertedVnodeQueue);
                                if (isTrue(isReactivated)) {
                                    reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
                                }
                                return true
                            }
                        }
                    }

                    function initComponent(vnode, insertedVnodeQueue) {
                        if (isDef(vnode.data.pendingInsert)) {
                            insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
                            vnode.data.pendingInsert = null;
                        }
                        vnode.elm = vnode.componentInstance.$el;
                        if (isPatchable(vnode)) {
                            invokeCreateHooks(vnode, insertedVnodeQueue);
                            setScope(vnode);
                        } else {
                            // empty component root.
                            // skip all element-related modules except for ref (#3455)
                            registerRef(vnode);
                            // make sure to invoke the insert hook
                            insertedVnodeQueue.push(vnode);
                        }
                    }

                    function reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm) {
                        var i;
                        // hack for #4339: a reactivated component with inner transition
                        // does not trigger because the inner node's created hooks are not called
                        // again. It's not ideal to involve module-specific logic in here but
                        // there doesn't seem to be a better way to do it.
                        var innerNode = vnode;
                        while (innerNode.componentInstance) {
                            innerNode = innerNode.componentInstance._vnode;
                            if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
                                for (i = 0; i < cbs.activate.length; ++i) {
                                    cbs.activate[i](emptyNode, innerNode);
                                }
                                insertedVnodeQueue.push(innerNode);
                                break
                            }
                        }
                        // unlike a newly created component,
                        // a reactivated keep-alive component doesn't insert itself
                        insert(parentElm, vnode.elm, refElm);
                    }

                    function insert(parent, elm, ref$$1) {
                        if (isDef(parent)) {
                            if (isDef(ref$$1)) {
                                if (ref$$1.parentNode === parent) {
                                    nodeOps.insertBefore(parent, elm, ref$$1);
                                }
                            } else {
                                nodeOps.appendChild(parent, elm);
                            }
                        }
                    }

                    function createChildren(vnode, children, insertedVnodeQueue) {
                        if (Array.isArray(children)) {
                            {
                                checkDuplicateKeys(children);
                            }
                            for (var i = 0; i < children.length; ++i) {
                                createElm(children[i], insertedVnodeQueue, vnode.elm, null, true, children, i);
                            }
                        } else if (isPrimitive(vnode.text)) {
                            nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(String(vnode.text)));
                        }
                    }

                    function isPatchable(vnode) {
                        while (vnode.componentInstance) {
                            vnode = vnode.componentInstance._vnode;
                        }
                        return isDef(vnode.tag)
                    }

                    function invokeCreateHooks(vnode, insertedVnodeQueue) {
                        for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
                            cbs.create[i$1](emptyNode, vnode);
                        }
                        i = vnode.data.hook; // Reuse variable
                        if (isDef(i)) {
                            if (isDef(i.create)) { i.create(emptyNode, vnode); }
                            if (isDef(i.insert)) { insertedVnodeQueue.push(vnode); }
                        }
                    }

                    // set scope id attribute for scoped CSS.
                    // this is implemented as a special case to avoid the overhead
                    // of going through the normal attribute patching process.
                    function setScope(vnode) {
                        var i;
                        if (isDef(i = vnode.fnScopeId)) {
                            nodeOps.setStyleScope(vnode.elm, i);
                        } else {
                            var ancestor = vnode;
                            while (ancestor) {
                                if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {
                                    nodeOps.setStyleScope(vnode.elm, i);
                                }
                                ancestor = ancestor.parent;
                            }
                        }
                        // for slot content they should also get the scopeId from the host instance.
                        if (isDef(i = activeInstance) &&
                            i !== vnode.context &&
                            i !== vnode.fnContext &&
                            isDef(i = i.$options._scopeId)
                        ) {
                            nodeOps.setStyleScope(vnode.elm, i);
                        }
                    }

                    function addVnodes(parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
                        for (; startIdx <= endIdx; ++startIdx) {
                            createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm, false, vnodes, startIdx);
                        }
                    }

                    function invokeDestroyHook(vnode) {
                        var i, j;
                        var data = vnode.data;
                        if (isDef(data)) {
                            if (isDef(i = data.hook) && isDef(i = i.destroy)) { i(vnode); }
                            for (i = 0; i < cbs.destroy.length; ++i) { cbs.destroy[i](vnode); }
                        }
                        if (isDef(i = vnode.children)) {
                            for (j = 0; j < vnode.children.length; ++j) {
                                invokeDestroyHook(vnode.children[j]);
                            }
                        }
                    }

                    function removeVnodes(parentElm, vnodes, startIdx, endIdx) {
                        for (; startIdx <= endIdx; ++startIdx) {
                            var ch = vnodes[startIdx];
                            if (isDef(ch)) {
                                if (isDef(ch.tag)) {
                                    removeAndInvokeRemoveHook(ch);
                                    invokeDestroyHook(ch);
                                } else { // Text node
                                    removeNode(ch.elm);
                                }
                            }
                        }
                    }

                    function removeAndInvokeRemoveHook(vnode, rm) {
                        if (isDef(rm) || isDef(vnode.data)) {
                            var i;
                            var listeners = cbs.remove.length + 1;
                            if (isDef(rm)) {
                                // we have a recursively passed down rm callback
                                // increase the listeners count
                                rm.listeners += listeners;
                            } else {
                                // directly removing
                                rm = createRmCb(vnode.elm, listeners);
                            }
                            // recursively invoke hooks on child component root node
                            if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
                                removeAndInvokeRemoveHook(i, rm);
                            }
                            for (i = 0; i < cbs.remove.length; ++i) {
                                cbs.remove[i](vnode, rm);
                            }
                            if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
                                i(vnode, rm);
                            } else {
                                rm();
                            }
                        } else {
                            removeNode(vnode.elm);
                        }
                    }

                    function updateChildren(parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
                        var oldStartIdx = 0;
                        var newStartIdx = 0;
                        var oldEndIdx = oldCh.length - 1;
                        var oldStartVnode = oldCh[0];
                        var oldEndVnode = oldCh[oldEndIdx];
                        var newEndIdx = newCh.length - 1;
                        var newStartVnode = newCh[0];
                        var newEndVnode = newCh[newEndIdx];
                        var oldKeyToIdx, idxInOld, vnodeToMove, refElm;

                        // removeOnly is a special flag used only by <transition-group>
                        // to ensure removed elements stay in correct relative positions
                        // during leaving transitions
                        var canMove = !removeOnly;

                        {
                            checkDuplicateKeys(newCh);
                        }

                        while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
                            if (isUndef(oldStartVnode)) {
                                oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
                            } else if (isUndef(oldEndVnode)) {
                                oldEndVnode = oldCh[--oldEndIdx];
                            } else if (sameVnode(oldStartVnode, newStartVnode)) {
                                patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue);
                                oldStartVnode = oldCh[++oldStartIdx];
                                newStartVnode = newCh[++newStartIdx];
                            } else if (sameVnode(oldEndVnode, newEndVnode)) {
                                patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue);
                                oldEndVnode = oldCh[--oldEndIdx];
                                newEndVnode = newCh[--newEndIdx];
                            } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
                                patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue);
                                canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
                                oldStartVnode = oldCh[++oldStartIdx];
                                newEndVnode = newCh[--newEndIdx];
                            } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
                                patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);
                                canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
                                oldEndVnode = oldCh[--oldEndIdx];
                                newStartVnode = newCh[++newStartIdx];
                            } else {
                                if (isUndef(oldKeyToIdx)) { oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx); }
                                idxInOld = isDef(newStartVnode.key) ?
                                    oldKeyToIdx[newStartVnode.key] :
                                    findIdxInOld(newStartVnode, oldCh, oldStartIdx, oldEndIdx);
                                if (isUndef(idxInOld)) { // New element
                                    createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
                                } else {
                                    vnodeToMove = oldCh[idxInOld];
                                    if (sameVnode(vnodeToMove, newStartVnode)) {
                                        patchVnode(vnodeToMove, newStartVnode, insertedVnodeQueue);
                                        oldCh[idxInOld] = undefined;
                                        canMove && nodeOps.insertBefore(parentElm, vnodeToMove.elm, oldStartVnode.elm);
                                    } else {
                                        // same key but different element. treat as new element
                                        createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm, false, newCh, newStartIdx);
                                    }
                                }
                                newStartVnode = newCh[++newStartIdx];
                            }
                        }
                        if (oldStartIdx > oldEndIdx) {
                            refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;
                            addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
                        } else if (newStartIdx > newEndIdx) {
                            removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);
                        }
                    }

                    function checkDuplicateKeys(children) {
                        var seenKeys = {};
                        for (var i = 0; i < children.length; i++) {
                            var vnode = children[i];
                            var key = vnode.key;
                            if (isDef(key)) {
                                if (seenKeys[key]) {
                                    warn(
                                        ("Duplicate keys detected: '" + key + "'. This may cause an update error."),
                                        vnode.context
                                    );
                                } else {
                                    seenKeys[key] = true;
                                }
                            }
                        }
                    }

                    function findIdxInOld(node, oldCh, start, end) {
                        for (var i = start; i < end; i++) {
                            var c = oldCh[i];
                            if (isDef(c) && sameVnode(node, c)) { return i }
                        }
                    }

                    function patchVnode(oldVnode, vnode, insertedVnodeQueue, removeOnly) {
                        if (oldVnode === vnode) {
                            return
                        }

                        var elm = vnode.elm = oldVnode.elm;

                        if (isTrue(oldVnode.isAsyncPlaceholder)) {
                            if (isDef(vnode.asyncFactory.resolved)) {
                                hydrate(oldVnode.elm, vnode, insertedVnodeQueue);
                            } else {
                                vnode.isAsyncPlaceholder = true;
                            }
                            return
                        }

                        // reuse element for static trees.
                        // note we only do this if the vnode is cloned -
                        // if the new node is not cloned it means the render functions have been
                        // reset by the hot-reload-api and we need to do a proper re-render.
                        if (isTrue(vnode.isStatic) &&
                            isTrue(oldVnode.isStatic) &&
                            vnode.key === oldVnode.key &&
                            (isTrue(vnode.isCloned) || isTrue(vnode.isOnce))
                        ) {
                            vnode.componentInstance = oldVnode.componentInstance;
                            return
                        }

                        var i;
                        var data = vnode.data;
                        if (isDef(data) && isDef(i = data.hook) && isDef(i = i.prepatch)) {
                            i(oldVnode, vnode);
                        }

                        var oldCh = oldVnode.children;
                        var ch = vnode.children;
                        if (isDef(data) && isPatchable(vnode)) {
                            for (i = 0; i < cbs.update.length; ++i) { cbs.update[i](oldVnode, vnode); }
                            if (isDef(i = data.hook) && isDef(i = i.update)) { i(oldVnode, vnode); }
                        }
                        if (isUndef(vnode.text)) {
                            if (isDef(oldCh) && isDef(ch)) {
                                if (oldCh !== ch) { updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly); }
                            } else if (isDef(ch)) {
                                if (isDef(oldVnode.text)) { nodeOps.setTextContent(elm, ''); }
                                addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
                            } else if (isDef(oldCh)) {
                                removeVnodes(elm, oldCh, 0, oldCh.length - 1);
                            } else if (isDef(oldVnode.text)) {
                                nodeOps.setTextContent(elm, '');
                            }
                        } else if (oldVnode.text !== vnode.text) {
                            nodeOps.setTextContent(elm, vnode.text);
                        }
                        if (isDef(data)) {
                            if (isDef(i = data.hook) && isDef(i = i.postpatch)) { i(oldVnode, vnode); }
                        }
                    }

                    function invokeInsertHook(vnode, queue, initial) {
                        // delay insert hooks for component root nodes, invoke them after the
                        // element is really inserted
                        if (isTrue(initial) && isDef(vnode.parent)) {
                            vnode.parent.data.pendingInsert = queue;
                        } else {
                            for (var i = 0; i < queue.length; ++i) {
                                queue[i].data.hook.insert(queue[i]);
                            }
                        }
                    }

                    var hydrationBailed = false;
                    // list of modules that can skip create hook during hydration because they
                    // are already rendered on the client or has no need for initialization
                    // Note: style is excluded because it relies on initial clone for future
                    // deep updates (#7063).
                    var isRenderedModule = makeMap('attrs,class,staticClass,staticStyle,key');

                    // Note: this is a browser-only function so we can assume elms are DOM nodes.
                    function hydrate(elm, vnode, insertedVnodeQueue, inVPre) {
                        var i;
                        var tag = vnode.tag;
                        var data = vnode.data;
                        var children = vnode.children;
                        inVPre = inVPre || (data && data.pre);
                        vnode.elm = elm;

                        if (isTrue(vnode.isComment) && isDef(vnode.asyncFactory)) {
                            vnode.isAsyncPlaceholder = true;
                            return true
                        }
                        // assert node match
                        {
                            if (!assertNodeMatch(elm, vnode, inVPre)) {
                                return false
                            }
                        }
                        if (isDef(data)) {
                            if (isDef(i = data.hook) && isDef(i = i.init)) { i(vnode, true /* hydrating */ ); }
                            if (isDef(i = vnode.componentInstance)) {
                                // child component. it should have hydrated its own tree.
                                initComponent(vnode, insertedVnodeQueue);
                                return true
                            }
                        }
                        if (isDef(tag)) {
                            if (isDef(children)) {
                                // empty element, allow client to pick up and populate children
                                if (!elm.hasChildNodes()) {
                                    createChildren(vnode, children, insertedVnodeQueue);
                                } else {
                                    // v-html and domProps: innerHTML
                                    if (isDef(i = data) && isDef(i = i.domProps) && isDef(i = i.innerHTML)) {
                                        if (i !== elm.innerHTML) {
                                            /* istanbul ignore if */
                                            if ("development" !== 'production' &&
                                                typeof console !== 'undefined' &&
                                                !hydrationBailed
                                            ) {
                                                hydrationBailed = true;
                                                console.warn('Parent: ', elm);
                                                console.warn('server innerHTML: ', i);
                                                console.warn('client innerHTML: ', elm.innerHTML);
                                            }
                                            return false
                                        }
                                    } else {
                                        // iterate and compare children lists
                                        var childrenMatch = true;
                                        var childNode = elm.firstChild;
                                        for (var i$1 = 0; i$1 < children.length; i$1++) {
                                            if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue, inVPre)) {
                                                childrenMatch = false;
                                                break
                                            }
                                            childNode = childNode.nextSibling;
                                        }
                                        // if childNode is not null, it means the actual childNodes list is
                                        // longer than the virtual children list.
                                        if (!childrenMatch || childNode) {
                                            /* istanbul ignore if */
                                            if ("development" !== 'production' &&
                                                typeof console !== 'undefined' &&
                                                !hydrationBailed
                                            ) {
                                                hydrationBailed = true;
                                                console.warn('Parent: ', elm);
                                                console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
                                            }
                                            return false
                                        }
                                    }
                                }
                            }
                            if (isDef(data)) {
                                var fullInvoke = false;
                                for (var key in data) {
                                    if (!isRenderedModule(key)) {
                                        fullInvoke = true;
                                        invokeCreateHooks(vnode, insertedVnodeQueue);
                                        break
                                    }
                                }
                                if (!fullInvoke && data['class']) {
                                    // ensure collecting deps for deep class bindings for future updates
                                    traverse(data['class']);
                                }
                            }
                        } else if (elm.data !== vnode.text) {
                            elm.data = vnode.text;
                        }
                        return true
                    }

                    function assertNodeMatch(node, vnode, inVPre) {
                        if (isDef(vnode.tag)) {
                            return vnode.tag.indexOf('vue-component') === 0 || (!isUnknownElement$$1(vnode, inVPre) &&
                                vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())
                            )
                        } else {
                            return node.nodeType === (vnode.isComment ? 8 : 3)
                        }
                    }

                    return function patch(oldVnode, vnode, hydrating, removeOnly, parentElm, refElm) {
                        if (isUndef(vnode)) {
                            if (isDef(oldVnode)) { invokeDestroyHook(oldVnode); }
                            return
                        }

                        var isInitialPatch = false;
                        var insertedVnodeQueue = [];

                        if (isUndef(oldVnode)) {
                            // empty mount (likely as component), create new root element
                            isInitialPatch = true;
                            createElm(vnode, insertedVnodeQueue, parentElm, refElm);
                        } else {
                            var isRealElement = isDef(oldVnode.nodeType);
                            if (!isRealElement && sameVnode(oldVnode, vnode)) {
                                // patch existing root node
                                patchVnode(oldVnode, vnode, insertedVnodeQueue, removeOnly);
                            } else {
                                if (isRealElement) {
                                    // mounting to a real element
                                    // check if this is server-rendered content and if we can perform
                                    // a successful hydration.
                                    if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {
                                        oldVnode.removeAttribute(SSR_ATTR);
                                        hydrating = true;
                                    }
                                    if (isTrue(hydrating)) {
                                        if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
                                            invokeInsertHook(vnode, insertedVnodeQueue, true);
                                            return oldVnode
                                        } else {
                                            warn(
                                                'The client-side rendered virtual DOM tree is not matching ' +
                                                'server-rendered content. This is likely caused by incorrect ' +
                                                'HTML markup, for example nesting block-level elements inside ' +
                                                '<p>, or missing <tbody>. Bailing hydration and performing ' +
                                                'full client-side render.'
                                            );
                                        }
                                    }
                                    // either not server-rendered, or hydration failed.
                                    // create an empty node and replace it
                                    oldVnode = emptyNodeAt(oldVnode);
                                }

                                // replacing existing element
                                var oldElm = oldVnode.elm;
                                var parentElm$1 = nodeOps.parentNode(oldElm);

                                // create new node
                                createElm(
                                    vnode,
                                    insertedVnodeQueue,
                                    // extremely rare edge case: do not insert if old element is in a
                                    // leaving transition. Only happens when combining transition +
                                    // keep-alive + HOCs. (#4590)
                                    oldElm._leaveCb ? null : parentElm$1,
                                    nodeOps.nextSibling(oldElm)
                                );

                                // update parent placeholder node element, recursively
                                if (isDef(vnode.parent)) {
                                    var ancestor = vnode.parent;
                                    var patchable = isPatchable(vnode);
                                    while (ancestor) {
                                        for (var i = 0; i < cbs.destroy.length; ++i) {
                                            cbs.destroy[i](ancestor);
                                        }
                                        ancestor.elm = vnode.elm;
                                        if (patchable) {
                                            for (var i$1 = 0; i$1 < cbs.create.length; ++i$1) {
                                                cbs.create[i$1](emptyNode, ancestor);
                                            }
                                            // #6513
                                            // invoke insert hooks that may have been merged by create hooks.
                                            // e.g. for directives that uses the "inserted" hook.
                                            var insert = ancestor.data.hook.insert;
                                            if (insert.merged) {
                                                // start at index 1 to avoid re-invoking component mounted hook
                                                for (var i$2 = 1; i$2 < insert.fns.length; i$2++) {
                                                    insert.fns[i$2]();
                                                }
                                            }
                                        } else {
                                            registerRef(ancestor);
                                        }
                                        ancestor = ancestor.parent;
                                    }
                                }

                                // destroy old node
                                if (isDef(parentElm$1)) {
                                    removeVnodes(parentElm$1, [oldVnode], 0, 0);
                                } else if (isDef(oldVnode.tag)) {
                                    invokeDestroyHook(oldVnode);
                                }
                            }
                        }

                        invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
                        return vnode.elm
                    }
                }

                /*  */

                var directives = {
                    create: updateDirectives,
                    update: updateDirectives,
                    destroy: function unbindDirectives(vnode) {
                        updateDirectives(vnode, emptyNode);
                    }
                }

                function updateDirectives(oldVnode, vnode) {
                    if (oldVnode.data.directives || vnode.data.directives) {
                        _update(oldVnode, vnode);
                    }
                }

                function _update(oldVnode, vnode) {
                    var isCreate = oldVnode === emptyNode;
                    var isDestroy = vnode === emptyNode;
                    var oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
                    var newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);

                    var dirsWithInsert = [];
                    var dirsWithPostpatch = [];

                    var key, oldDir, dir;
                    for (key in newDirs) {
                        oldDir = oldDirs[key];
                        dir = newDirs[key];
                        if (!oldDir) {
                            // new directive, bind
                            callHook$1(dir, 'bind', vnode, oldVnode);
                            if (dir.def && dir.def.inserted) {
                                dirsWithInsert.push(dir);
                            }
                        } else {
                            // existing directive, update
                            dir.oldValue = oldDir.value;
                            callHook$1(dir, 'update', vnode, oldVnode);
                            if (dir.def && dir.def.componentUpdated) {
                                dirsWithPostpatch.push(dir);
                            }
                        }
                    }

                    if (dirsWithInsert.length) {
                        var callInsert = function() {
                            for (var i = 0; i < dirsWithInsert.length; i++) {
                                callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
                            }
                        };
                        if (isCreate) {
                            mergeVNodeHook(vnode, 'insert', callInsert);
                        } else {
                            callInsert();
                        }
                    }

                    if (dirsWithPostpatch.length) {
                        mergeVNodeHook(vnode, 'postpatch', function() {
                            for (var i = 0; i < dirsWithPostpatch.length; i++) {
                                callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);
                            }
                        });
                    }

                    if (!isCreate) {
                        for (key in oldDirs) {
                            if (!newDirs[key]) {
                                // no longer present, unbind
                                callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);
                            }
                        }
                    }
                }

                var emptyModifiers = Object.create(null);

                function normalizeDirectives$1(
                    dirs,
                    vm
                ) {
                    var res = Object.create(null);
                    if (!dirs) {
                        // $flow-disable-line
                        return res
                    }
                    var i, dir;
                    for (i = 0; i < dirs.length; i++) {
                        dir = dirs[i];
                        if (!dir.modifiers) {
                            // $flow-disable-line
                            dir.modifiers = emptyModifiers;
                        }
                        res[getRawDirName(dir)] = dir;
                        dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
                    }
                    // $flow-disable-line
                    return res
                }

                function getRawDirName(dir) {
                    return dir.rawName || ((dir.name) + "." + (Object.keys(dir.modifiers || {}).join('.')))
                }

                function callHook$1(dir, hook, vnode, oldVnode, isDestroy) {
                    var fn = dir.def && dir.def[hook];
                    if (fn) {
                        try {
                            fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
                        } catch (e) {
                            handleError(e, vnode.context, ("directive " + (dir.name) + " " + hook + " hook"));
                        }
                    }
                }

                var baseModules = [
                    ref,
                    directives
                ]

                /*  */

                function updateAttrs(oldVnode, vnode) {
                    var opts = vnode.componentOptions;
                    if (isDef(opts) && opts.Ctor.options.inheritAttrs === false) {
                        return
                    }
                    if (isUndef(oldVnode.data.attrs) && isUndef(vnode.data.attrs)) {
                        return
                    }
                    var key, cur, old;
                    var elm = vnode.elm;
                    var oldAttrs = oldVnode.data.attrs || {};
                    var attrs = vnode.data.attrs || {};
                    // clone observed objects, as the user probably wants to mutate it
                    if (isDef(attrs.__ob__)) {
                        attrs = vnode.data.attrs = extend({}, attrs);
                    }

                    for (key in attrs) {
                        cur = attrs[key];
                        old = oldAttrs[key];
                        if (old !== cur) {
                            setAttr(elm, key, cur);
                        }
                    }
                    // #4391: in IE9, setting type can reset value for input[type=radio]
                    // #6666: IE/Edge forces progress value down to 1 before setting a max
                    /* istanbul ignore if */
                    if ((isIE || isEdge) && attrs.value !== oldAttrs.value) {
                        setAttr(elm, 'value', attrs.value);
                    }
                    for (key in oldAttrs) {
                        if (isUndef(attrs[key])) {
                            if (isXlink(key)) {
                                elm.removeAttributeNS(xlinkNS, getXlinkProp(key));
                            } else if (!isEnumeratedAttr(key)) {
                                elm.removeAttribute(key);
                            }
                        }
                    }
                }

                function setAttr(el, key, value) {
                    if (el.tagName.indexOf('-') > -1) {
                        baseSetAttr(el, key, value);
                    } else if (isBooleanAttr(key)) {
                        // set attribute for blank value
                        // e.g. <option disabled>Select one</option>
                        if (isFalsyAttrValue(value)) {
                            el.removeAttribute(key);
                        } else {
                            // technically allowfullscreen is a boolean attribute for <iframe>,
                            // but Flash expects a value of "true" when used on <embed> tag
                            value = key === 'allowfullscreen' && el.tagName === 'EMBED' ?
                                'true' :
                                key;
                            el.setAttribute(key, value);
                        }
                    } else if (isEnumeratedAttr(key)) {
                        el.setAttribute(key, isFalsyAttrValue(value) || value === 'false' ? 'false' : 'true');
                    } else if (isXlink(key)) {
                        if (isFalsyAttrValue(value)) {
                            el.removeAttributeNS(xlinkNS, getXlinkProp(key));
                        } else {
                            el.setAttributeNS(xlinkNS, key, value);
                        }
                    } else {
                        baseSetAttr(el, key, value);
                    }
                }

                function baseSetAttr(el, key, value) {
                    if (isFalsyAttrValue(value)) {
                        el.removeAttribute(key);
                    } else {
                        // #7138: IE10 & 11 fires input event when setting placeholder on
                        // <textarea>... block the first input event and remove the blocker
                        // immediately.
                        /* istanbul ignore if */
                        if (
                            isIE && !isIE9 &&
                            el.tagName === 'TEXTAREA' &&
                            key === 'placeholder' && !el.__ieph
                        ) {
                            var blocker = function(e) {
                                e.stopImmediatePropagation();
                                el.removeEventListener('input', blocker);
                            };
                            el.addEventListener('input', blocker);
                            // $flow-disable-line
                            el.__ieph = true; /* IE placeholder patched */
                        }
                        el.setAttribute(key, value);
                    }
                }

                var attrs = {
                    create: updateAttrs,
                    update: updateAttrs
                }

                /*  */

                function updateClass(oldVnode, vnode) {
                    var el = vnode.elm;
                    var data = vnode.data;
                    var oldData = oldVnode.data;
                    if (
                        isUndef(data.staticClass) &&
                        isUndef(data.class) && (
                            isUndef(oldData) || (
                                isUndef(oldData.staticClass) &&
                                isUndef(oldData.class)
                            )
                        )
                    ) {
                        return
                    }

                    var cls = genClassForVnode(vnode);

                    // handle transition classes
                    var transitionClass = el._transitionClasses;
                    if (isDef(transitionClass)) {
                        cls = concat(cls, stringifyClass(transitionClass));
                    }

                    // set the class
                    if (cls !== el._prevClass) {
                        el.setAttribute('class', cls);
                        el._prevClass = cls;
                    }
                }

                var klass = {
                    create: updateClass,
                    update: updateClass
                }

                /*  */

                var validDivisionCharRE = /[\w).+\-_$\]]/;

                function parseFilters(exp) {
                    var inSingle = false;
                    var inDouble = false;
                    var inTemplateString = false;
                    var inRegex = false;
                    var curly = 0;
                    var square = 0;
                    var paren = 0;
                    var lastFilterIndex = 0;
                    var c, prev, i, expression, filters;

                    for (i = 0; i < exp.length; i++) {
                        prev = c;
                        c = exp.charCodeAt(i);
                        if (inSingle) {
                            if (c === 0x27 && prev !== 0x5C) { inSingle = false; }
                        } else if (inDouble) {
                            if (c === 0x22 && prev !== 0x5C) { inDouble = false; }
                        } else if (inTemplateString) {
                            if (c === 0x60 && prev !== 0x5C) { inTemplateString = false; }
                        } else if (inRegex) {
                            if (c === 0x2f && prev !== 0x5C) { inRegex = false; }
                        } else if (
                            c === 0x7C && // pipe
                            exp.charCodeAt(i + 1) !== 0x7C &&
                            exp.charCodeAt(i - 1) !== 0x7C &&
                            !curly && !square && !paren
                        ) {
                            if (expression === undefined) {
                                // first filter, end of expression
                                lastFilterIndex = i + 1;
                                expression = exp.slice(0, i).trim();
                            } else {
                                pushFilter();
                            }
                        } else {
                            switch (c) {
                                case 0x22:
                                    inDouble = true;
                                    break // "
                                case 0x27:
                                    inSingle = true;
                                    break // '
                                case 0x60:
                                    inTemplateString = true;
                                    break // `
                                case 0x28:
                                    paren++;
                                    break // (
                                case 0x29:
                                    paren--;
                                    break // )
                                case 0x5B:
                                    square++;
                                    break // [
                                case 0x5D:
                                    square--;
                                    break // ]
                                case 0x7B:
                                    curly++;
                                    break // {
                                case 0x7D:
                                    curly--;
                                    break // }
                            }
                            if (c === 0x2f) { // /
                                var j = i - 1;
                                var p = (void 0);
                                // find first non-whitespace prev char
                                for (; j >= 0; j--) {
                                    p = exp.charAt(j);
                                    if (p !== ' ') { break }
                                }
                                if (!p || !validDivisionCharRE.test(p)) {
                                    inRegex = true;
                                }
                            }
                        }
                    }

                    if (expression === undefined) {
                        expression = exp.slice(0, i).trim();
                    } else if (lastFilterIndex !== 0) {
                        pushFilter();
                    }

                    function pushFilter() {
                        (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());
                        lastFilterIndex = i + 1;
                    }

                    if (filters) {
                        for (i = 0; i < filters.length; i++) {
                            expression = wrapFilter(expression, filters[i]);
                        }
                    }

                    return expression
                }

                function wrapFilter(exp, filter) {
                    var i = filter.indexOf('(');
                    if (i < 0) {
                        // _f: resolveFilter
                        return ("_f(\"" + filter + "\")(" + exp + ")")
                    } else {
                        var name = filter.slice(0, i);
                        var args = filter.slice(i + 1);
                        return ("_f(\"" + name + "\")(" + exp + (args !== ')' ? ',' + args : args))
                    }
                }

                /*  */

                function baseWarn(msg) {
                    console.error(("[Vue compiler]: " + msg));
                }

                function pluckModuleFunction(
                    modules,
                    key
                ) {
                    return modules ?
                        modules.map(function(m) { return m[key]; }).filter(function(_) { return _; }) :
                        []
                }

                function addProp(el, name, value) {
                    (el.props || (el.props = [])).push({ name: name, value: value });
                    el.plain = false;
                }

                function addAttr(el, name, value) {
                    (el.attrs || (el.attrs = [])).push({ name: name, value: value });
                    el.plain = false;
                }

                // add a raw attr (use this in preTransforms)
                function addRawAttr(el, name, value) {
                    el.attrsMap[name] = value;
                    el.attrsList.push({ name: name, value: value });
                }

                function addDirective(
                    el,
                    name,
                    rawName,
                    value,
                    arg,
                    modifiers
                ) {
                    (el.directives || (el.directives = [])).push({ name: name, rawName: rawName, value: value, arg: arg, modifiers: modifiers });
                    el.plain = false;
                }

                function addHandler(
                    el,
                    name,
                    value,
                    modifiers,
                    important,
                    warn
                ) {
                    modifiers = modifiers || emptyObject;
                    // warn prevent and passive modifier
                    /* istanbul ignore if */
                    if (
                        "development" !== 'production' && warn &&
                        modifiers.prevent && modifiers.passive
                    ) {
                        warn(
                            'passive and prevent can\'t be used together. ' +
                            'Passive handler can\'t prevent default event.'
                        );
                    }

                    // check capture modifier
                    if (modifiers.capture) {
                        delete modifiers.capture;
                        name = '!' + name; // mark the event as captured
                    }
                    if (modifiers.once) {
                        delete modifiers.once;
                        name = '~' + name; // mark the event as once
                    }
                    /* istanbul ignore if */
                    if (modifiers.passive) {
                        delete modifiers.passive;
                        name = '&' + name; // mark the event as passive
                    }

                    // normalize click.right and click.middle since they don't actually fire
                    // this is technically browser-specific, but at least for now browsers are
                    // the only target envs that have right/middle clicks.
                    if (name === 'click') {
                        if (modifiers.right) {
                            name = 'contextmenu';
                            delete modifiers.right;
                        } else if (modifiers.middle) {
                            name = 'mouseup';
                        }
                    }

                    var events;
                    if (modifiers.native) {
                        delete modifiers.native;
                        events = el.nativeEvents || (el.nativeEvents = {});
                    } else {
                        events = el.events || (el.events = {});
                    }

                    var newHandler = {
                        value: value.trim()
                    };
                    if (modifiers !== emptyObject) {
                        newHandler.modifiers = modifiers;
                    }

                    var handlers = events[name];
                    /* istanbul ignore if */
                    if (Array.isArray(handlers)) {
                        important ? handlers.unshift(newHandler) : handlers.push(newHandler);
                    } else if (handlers) {
                        events[name] = important ? [newHandler, handlers] : [handlers, newHandler];
                    } else {
                        events[name] = newHandler;
                    }

                    el.plain = false;
                }

                function getBindingAttr(
                    el,
                    name,
                    getStatic
                ) {
                    var dynamicValue =
                        getAndRemoveAttr(el, ':' + name) ||
                        getAndRemoveAttr(el, 'v-bind:' + name);
                    if (dynamicValue != null) {
                        return parseFilters(dynamicValue)
                    } else if (getStatic !== false) {
                        var staticValue = getAndRemoveAttr(el, name);
                        if (staticValue != null) {
                            return JSON.stringify(staticValue)
                        }
                    }
                }

                // note: this only removes the attr from the Array (attrsList) so that it
                // doesn't get processed by processAttrs.
                // By default it does NOT remove it from the map (attrsMap) because the map is
                // needed during codegen.
                function getAndRemoveAttr(
                    el,
                    name,
                    removeFromMap
                ) {
                    var val;
                    if ((val = el.attrsMap[name]) != null) {
                        var list = el.attrsList;
                        for (var i = 0, l = list.length; i < l; i++) {
                            if (list[i].name === name) {
                                list.splice(i, 1);
                                break
                            }
                        }
                    }
                    if (removeFromMap) {
                        delete el.attrsMap[name];
                    }
                    return val
                }

                /*  */

                /**
                 * Cross-platform code generation for component v-model
                 */
                function genComponentModel(
                    el,
                    value,
                    modifiers
                ) {
                    var ref = modifiers || {};
                    var number = ref.number;
                    var trim = ref.trim;

                    var baseValueExpression = '$$v';
                    var valueExpression = baseValueExpression;
                    if (trim) {
                        valueExpression =
                            "(typeof " + baseValueExpression + " === 'string'" +
                            "? " + baseValueExpression + ".trim()" +
                            ": " + baseValueExpression + ")";
                    }
                    if (number) {
                        valueExpression = "_n(" + valueExpression + ")";
                    }
                    var assignment = genAssignmentCode(value, valueExpression);

                    el.model = {
                        value: ("(" + value + ")"),
                        expression: ("\"" + value + "\""),
                        callback: ("function (" + baseValueExpression + ") {" + assignment + "}")
                    };
                }

                /**
                 * Cross-platform codegen helper for generating v-model value assignment code.
                 */
                function genAssignmentCode(
                    value,
                    assignment
                ) {
                    var res = parseModel(value);
                    if (res.key === null) {
                        return (value + "=" + assignment)
                    } else {
                        return ("$set(" + (res.exp) + ", " + (res.key) + ", " + assignment + ")")
                    }
                }

                /**
                 * Parse a v-model expression into a base path and a final key segment.
                 * Handles both dot-path and possible square brackets.
                 *
                 * Possible cases:
                 *
                 * - test
                 * - test[key]
                 * - test[test1[key]]
                 * - test["a"][key]
                 * - xxx.test[a[a].test1[key]]
                 * - test.xxx.a["asa"][test1[key]]
                 *
                 */

                var len;
                var str;
                var chr;
                var index$1;
                var expressionPos;
                var expressionEndPos;



                function parseModel(val) {
                    // Fix https://github.com/vuejs/vue/pull/7730
                    // allow v-model="obj.val " (trailing whitespace)
                    val = val.trim();
                    len = val.length;

                    if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {
                        index$1 = val.lastIndexOf('.');
                        if (index$1 > -1) {
                            return {
                                exp: val.slice(0, index$1),
                                key: '"' + val.slice(index$1 + 1) + '"'
                            }
                        } else {
                            return {
                                exp: val,
                                key: null
                            }
                        }
                    }

                    str = val;
                    index$1 = expressionPos = expressionEndPos = 0;

                    while (!eof()) {
                        chr = next();
                        /* istanbul ignore if */
                        if (isStringStart(chr)) {
                            parseString(chr);
                        } else if (chr === 0x5B) {
                            parseBracket(chr);
                        }
                    }

                    return {
                        exp: val.slice(0, expressionPos),
                        key: val.slice(expressionPos + 1, expressionEndPos)
                    }
                }

                function next() {
                    return str.charCodeAt(++index$1)
                }

                function eof() {
                    return index$1 >= len
                }

                function isStringStart(chr) {
                    return chr === 0x22 || chr === 0x27
                }

                function parseBracket(chr) {
                    var inBracket = 1;
                    expressionPos = index$1;
                    while (!eof()) {
                        chr = next();
                        if (isStringStart(chr)) {
                            parseString(chr);
                            continue
                        }
                        if (chr === 0x5B) { inBracket++; }
                        if (chr === 0x5D) { inBracket--; }
                        if (inBracket === 0) {
                            expressionEndPos = index$1;
                            break
                        }
                    }
                }

                function parseString(chr) {
                    var stringQuote = chr;
                    while (!eof()) {
                        chr = next();
                        if (chr === stringQuote) {
                            break
                        }
                    }
                }

                /*  */

                var warn$1;

                // in some cases, the event used has to be determined at runtime
                // so we used some reserved tokens during compile.
                var RANGE_TOKEN = '__r';
                var CHECKBOX_RADIO_TOKEN = '__c';

                function model(
                    el,
                    dir,
                    _warn
                ) {
                    warn$1 = _warn;
                    var value = dir.value;
                    var modifiers = dir.modifiers;
                    var tag = el.tag;
                    var type = el.attrsMap.type;

                    {
                        // inputs with type="file" are read only and setting the input's
                        // value will throw an error.
                        if (tag === 'input' && type === 'file') {
                            warn$1(
                                "<" + (el.tag) + " v-model=\"" + value + "\" type=\"file\">:\n" +
                                "File inputs are read only. Use a v-on:change listener instead."
                            );
                        }
                    }

                    if (el.component) {
                        genComponentModel(el, value, modifiers);
                        // component v-model doesn't need extra runtime
                        return false
                    } else if (tag === 'select') {
                        genSelect(el, value, modifiers);
                    } else if (tag === 'input' && type === 'checkbox') {
                        genCheckboxModel(el, value, modifiers);
                    } else if (tag === 'input' && type === 'radio') {
                        genRadioModel(el, value, modifiers);
                    } else if (tag === 'input' || tag === 'textarea') {
                        genDefaultModel(el, value, modifiers);
                    } else if (!config.isReservedTag(tag)) {
                        genComponentModel(el, value, modifiers);
                        // component v-model doesn't need extra runtime
                        return false
                    } else {
                        warn$1(
                            "<" + (el.tag) + " v-model=\"" + value + "\">: " +
                            "v-model is not supported on this element type. " +
                            'If you are working with contenteditable, it\'s recommended to ' +
                            'wrap a library dedicated for that purpose inside a custom component.'
                        );
                    }

                    // ensure runtime directive metadata
                    return true
                }

                function genCheckboxModel(
                    el,
                    value,
                    modifiers
                ) {
                    var number = modifiers && modifiers.number;
                    var valueBinding = getBindingAttr(el, 'value') || 'null';
                    var trueValueBinding = getBindingAttr(el, 'true-value') || 'true';
                    var falseValueBinding = getBindingAttr(el, 'false-value') || 'false';
                    addProp(el, 'checked',
                        "Array.isArray(" + value + ")" +
                        "?_i(" + value + "," + valueBinding + ")>-1" + (
                            trueValueBinding === 'true' ?
                            (":(" + value + ")") :
                            (":_q(" + value + "," + trueValueBinding + ")")
                        )
                    );
                    addHandler(el, 'change',
                        "var $$a=" + value + "," +
                        '$$el=$event.target,' +
                        "$$c=$$el.checked?(" + trueValueBinding + "):(" + falseValueBinding + ");" +
                        'if(Array.isArray($$a)){' +
                        "var $$v=" + (number ? '_n(' + valueBinding + ')' : valueBinding) + "," +
                        '$$i=_i($$a,$$v);' +
                        "if($$el.checked){$$i<0&&(" + (genAssignmentCode(value, '$$a.concat([$$v])')) + ")}" +
                        "else{$$i>-1&&(" + (genAssignmentCode(value, '$$a.slice(0,$$i).concat($$a.slice($$i+1))')) + ")}" +
                        "}else{" + (genAssignmentCode(value, '$$c')) + "}",
                        null, true
                    );
                }

                function genRadioModel(
                    el,
                    value,
                    modifiers
                ) {
                    var number = modifiers && modifiers.number;
                    var valueBinding = getBindingAttr(el, 'value') || 'null';
                    valueBinding = number ? ("_n(" + valueBinding + ")") : valueBinding;
                    addProp(el, 'checked', ("_q(" + value + "," + valueBinding + ")"));
                    addHandler(el, 'change', genAssignmentCode(value, valueBinding), null, true);
                }

                function genSelect(
                    el,
                    value,
                    modifiers
                ) {
                    var number = modifiers && modifiers.number;
                    var selectedVal = "Array.prototype.filter" +
                        ".call($event.target.options,function(o){return o.selected})" +
                        ".map(function(o){var val = \"_value\" in o ? o._value : o.value;" +
                        "return " + (number ? '_n(val)' : 'val') + "})";

                    var assignment = '$event.target.multiple ? $$selectedVal : $$selectedVal[0]';
                    var code = "var $$selectedVal = " + selectedVal + ";";
                    code = code + " " + (genAssignmentCode(value, assignment));
                    addHandler(el, 'change', code, null, true);
                }

                function genDefaultModel(
                    el,
                    value,
                    modifiers
                ) {
                    var type = el.attrsMap.type;

                    // warn if v-bind:value conflicts with v-model
                    // except for inputs with v-bind:type
                    {
                        var value$1 = el.attrsMap['v-bind:value'] || el.attrsMap[':value'];
                        var typeBinding = el.attrsMap['v-bind:type'] || el.attrsMap[':type'];
                        if (value$1 && !typeBinding) {
                            var binding = el.attrsMap['v-bind:value'] ? 'v-bind:value' : ':value';
                            warn$1(
                                binding + "=\"" + value$1 + "\" conflicts with v-model on the same element " +
                                'because the latter already expands to a value binding internally'
                            );
                        }
                    }

                    var ref = modifiers || {};
                    var lazy = ref.lazy;
                    var number = ref.number;
                    var trim = ref.trim;
                    var needCompositionGuard = !lazy && type !== 'range';
                    var event = lazy ?
                        'change' :
                        type === 'range' ?
                        RANGE_TOKEN :
                        'input';

                    var valueExpression = '$event.target.value';
                    if (trim) {
                        valueExpression = "$event.target.value.trim()";
                    }
                    if (number) {
                        valueExpression = "_n(" + valueExpression + ")";
                    }

                    var code = genAssignmentCode(value, valueExpression);
                    if (needCompositionGuard) {
                        code = "if($event.target.composing)return;" + code;
                    }

                    addProp(el, 'value', ("(" + value + ")"));
                    addHandler(el, event, code, null, true);
                    if (trim || number) {
                        addHandler(el, 'blur', '$forceUpdate()');
                    }
                }

                /*  */

                // normalize v-model event tokens that can only be determined at runtime.
                // it's important to place the event as the first in the array because
                // the whole point is ensuring the v-model callback gets called before
                // user-attached handlers.
                function normalizeEvents(on) {
                    /* istanbul ignore if */
                    if (isDef(on[RANGE_TOKEN])) {
                        // IE input[type=range] only supports `change` event
                        var event = isIE ? 'change' : 'input';
                        on[event] = [].concat(on[RANGE_TOKEN], on[event] || []);
                        delete on[RANGE_TOKEN];
                    }
                    // This was originally intended to fix #4521 but no longer necessary
                    // after 2.5. Keeping it for backwards compat with generated code from < 2.4
                    /* istanbul ignore if */
                    if (isDef(on[CHECKBOX_RADIO_TOKEN])) {
                        on.change = [].concat(on[CHECKBOX_RADIO_TOKEN], on.change || []);
                        delete on[CHECKBOX_RADIO_TOKEN];
                    }
                }

                var target$1;

                function createOnceHandler(handler, event, capture) {
                    var _target = target$1; // save current target element in closure
                    return function onceHandler() {
                        var res = handler.apply(null, arguments);
                        if (res !== null) {
                            remove$2(event, onceHandler, capture, _target);
                        }
                    }
                }

                function add$1(
                    event,
                    handler,
                    once$$1,
                    capture,
                    passive
                ) {
                    handler = withMacroTask(handler);
                    if (once$$1) { handler = createOnceHandler(handler, event, capture); }
                    target$1.addEventListener(
                        event,
                        handler,
                        supportsPassive ?
                        { capture: capture, passive: passive } :
                        capture
                    );
                }

                function remove$2(
                    event,
                    handler,
                    capture,
                    _target
                ) {
                    (_target || target$1).removeEventListener(
                        event,
                        handler._withTask || handler,
                        capture
                    );
                }

                function updateDOMListeners(oldVnode, vnode) {
                    if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {
                        return
                    }
                    var on = vnode.data.on || {};
                    var oldOn = oldVnode.data.on || {};
                    target$1 = vnode.elm;
                    normalizeEvents(on);
                    updateListeners(on, oldOn, add$1, remove$2, vnode.context);
                    target$1 = undefined;
                }

                var events = {
                    create: updateDOMListeners,
                    update: updateDOMListeners
                }

                /*  */

                function updateDOMProps(oldVnode, vnode) {
                    if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {
                        return
                    }
                    var key, cur;
                    var elm = vnode.elm;
                    var oldProps = oldVnode.data.domProps || {};
                    var props = vnode.data.domProps || {};
                    // clone observed objects, as the user probably wants to mutate it
                    if (isDef(props.__ob__)) {
                        props = vnode.data.domProps = extend({}, props);
                    }

                    for (key in oldProps) {
                        if (isUndef(props[key])) {
                            elm[key] = '';
                        }
                    }
                    for (key in props) {
                        cur = props[key];
                        // ignore children if the node has textContent or innerHTML,
                        // as these will throw away existing DOM nodes and cause removal errors
                        // on subsequent patches (#3360)
                        if (key === 'textContent' || key === 'innerHTML') {
                            if (vnode.children) { vnode.children.length = 0; }
                            if (cur === oldProps[key]) { continue }
                            // #6601 work around Chrome version <= 55 bug where single textNode
                            // replaced by innerHTML/textContent retains its parentNode property
                            if (elm.childNodes.length === 1) {
                                elm.removeChild(elm.childNodes[0]);
                            }
                        }

                        if (key === 'value') {
                            // store value as _value as well since
                            // non-string values will be stringified
                            elm._value = cur;
                            // avoid resetting cursor position when value is the same
                            var strCur = isUndef(cur) ? '' : String(cur);
                            if (shouldUpdateValue(elm, strCur)) {
                                elm.value = strCur;
                            }
                        } else {
                            elm[key] = cur;
                        }
                    }
                }

                // check platforms/web/util/attrs.js acceptValue


                function shouldUpdateValue(elm, checkVal) {
                    return (!elm.composing && (
                        elm.tagName === 'OPTION' ||
                        isNotInFocusAndDirty(elm, checkVal) ||
                        isDirtyWithModifiers(elm, checkVal)
                    ))
                }

                function isNotInFocusAndDirty(elm, checkVal) {
                    // return true when textbox (.number and .trim) loses focus and its value is
                    // not equal to the updated value
                    var notInFocus = true;
                    // #6157
                    // work around IE bug when accessing document.activeElement in an iframe
                    try { notInFocus = document.activeElement !== elm; } catch (e) {}
                    return notInFocus && elm.value !== checkVal
                }

                function isDirtyWithModifiers(elm, newVal) {
                    var value = elm.value;
                    var modifiers = elm._vModifiers; // injected by v-model runtime
                    if (isDef(modifiers)) {
                        if (modifiers.lazy) {
                            // inputs with lazy should only be updated when not in focus
                            return false
                        }
                        if (modifiers.number) {
                            return toNumber(value) !== toNumber(newVal)
                        }
                        if (modifiers.trim) {
                            return value.trim() !== newVal.trim()
                        }
                    }
                    return value !== newVal
                }

                var domProps = {
                    create: updateDOMProps,
                    update: updateDOMProps
                }

                /*  */

                var parseStyleText = cached(function(cssText) {
                    var res = {};
                    var listDelimiter = /;(?![^(]*\))/g;
                    var propertyDelimiter = /:(.+)/;
                    cssText.split(listDelimiter).forEach(function(item) {
                        if (item) {
                            var tmp = item.split(propertyDelimiter);
                            tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());
                        }
                    });
                    return res
                });

                // merge static and dynamic style data on the same vnode
                function normalizeStyleData(data) {
                    var style = normalizeStyleBinding(data.style);
                    // static style is pre-processed into an object during compilation
                    // and is always a fresh object, so it's safe to merge into it
                    return data.staticStyle ?
                        extend(data.staticStyle, style) :
                        style
                }

                // normalize possible array / string values into Object
                function normalizeStyleBinding(bindingStyle) {
                    if (Array.isArray(bindingStyle)) {
                        return toObject(bindingStyle)
                    }
                    if (typeof bindingStyle === 'string') {
                        return parseStyleText(bindingStyle)
                    }
                    return bindingStyle
                }

                /**
                 * parent component style should be after child's
                 * so that parent component's style could override it
                 */
                function getStyle(vnode, checkChild) {
                    var res = {};
                    var styleData;

                    if (checkChild) {
                        var childNode = vnode;
                        while (childNode.componentInstance) {
                            childNode = childNode.componentInstance._vnode;
                            if (
                                childNode && childNode.data &&
                                (styleData = normalizeStyleData(childNode.data))
                            ) {
                                extend(res, styleData);
                            }
                        }
                    }

                    if ((styleData = normalizeStyleData(vnode.data))) {
                        extend(res, styleData);
                    }

                    var parentNode = vnode;
                    while ((parentNode = parentNode.parent)) {
                        if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {
                            extend(res, styleData);
                        }
                    }
                    return res
                }

                /*  */

                var cssVarRE = /^--/;
                var importantRE = /\s*!important$/;
                var setProp = function(el, name, val) {
                    /* istanbul ignore if */
                    if (cssVarRE.test(name)) {
                        el.style.setProperty(name, val);
                    } else if (importantRE.test(val)) {
                        el.style.setProperty(name, val.replace(importantRE, ''), 'important');
                    } else {
                        var normalizedName = normalize(name);
                        if (Array.isArray(val)) {
                            // Support values array created by autoprefixer, e.g.
                            // {display: ["-webkit-box", "-ms-flexbox", "flex"]}
                            // Set them one by one, and the browser will only set those it can recognize
                            for (var i = 0, len = val.length; i < len; i++) {
                                el.style[normalizedName] = val[i];
                            }
                        } else {
                            el.style[normalizedName] = val;
                        }
                    }
                };

                var vendorNames = ['Webkit', 'Moz', 'ms'];

                var emptyStyle;
                var normalize = cached(function(prop) {
                    emptyStyle = emptyStyle || document.createElement('div').style;
                    prop = camelize(prop);
                    if (prop !== 'filter' && (prop in emptyStyle)) {
                        return prop
                    }
                    var capName = prop.charAt(0).toUpperCase() + prop.slice(1);
                    for (var i = 0; i < vendorNames.length; i++) {
                        var name = vendorNames[i] + capName;
                        if (name in emptyStyle) {
                            return name
                        }
                    }
                });

                function updateStyle(oldVnode, vnode) {
                    var data = vnode.data;
                    var oldData = oldVnode.data;

                    if (isUndef(data.staticStyle) && isUndef(data.style) &&
                        isUndef(oldData.staticStyle) && isUndef(oldData.style)
                    ) {
                        return
                    }

                    var cur, name;
                    var el = vnode.elm;
                    var oldStaticStyle = oldData.staticStyle;
                    var oldStyleBinding = oldData.normalizedStyle || oldData.style || {};

                    // if static style exists, stylebinding already merged into it when doing normalizeStyleData
                    var oldStyle = oldStaticStyle || oldStyleBinding;

                    var style = normalizeStyleBinding(vnode.data.style) || {};

                    // store normalized style under a different key for next diff
                    // make sure to clone it if it's reactive, since the user likely wants
                    // to mutate it.
                    vnode.data.normalizedStyle = isDef(style.__ob__) ?
                        extend({}, style) :
                        style;

                    var newStyle = getStyle(vnode, true);

                    for (name in oldStyle) {
                        if (isUndef(newStyle[name])) {
                            setProp(el, name, '');
                        }
                    }
                    for (name in newStyle) {
                        cur = newStyle[name];
                        if (cur !== oldStyle[name]) {
                            // ie9 setting to null has no effect, must use empty string
                            setProp(el, name, cur == null ? '' : cur);
                        }
                    }
                }

                var style = {
                    create: updateStyle,
                    update: updateStyle
                }

                /*  */

                /**
                 * Add class with compatibility for SVG since classList is not supported on
                 * SVG elements in IE
                 */
                function addClass(el, cls) {
                    /* istanbul ignore if */
                    if (!cls || !(cls = cls.trim())) {
                        return
                    }

                    /* istanbul ignore else */
                    if (el.classList) {
                        if (cls.indexOf(' ') > -1) {
                            cls.split(/\s+/).forEach(function(c) { return el.classList.add(c); });
                        } else {
                            el.classList.add(cls);
                        }
                    } else {
                        var cur = " " + (el.getAttribute('class') || '') + " ";
                        if (cur.indexOf(' ' + cls + ' ') < 0) {
                            el.setAttribute('class', (cur + cls).trim());
                        }
                    }
                }

                /**
                 * Remove class with compatibility for SVG since classList is not supported on
                 * SVG elements in IE
                 */
                function removeClass(el, cls) {
                    /* istanbul ignore if */
                    if (!cls || !(cls = cls.trim())) {
                        return
                    }

                    /* istanbul ignore else */
                    if (el.classList) {
                        if (cls.indexOf(' ') > -1) {
                            cls.split(/\s+/).forEach(function(c) { return el.classList.remove(c); });
                        } else {
                            el.classList.remove(cls);
                        }
                        if (!el.classList.length) {
                            el.removeAttribute('class');
                        }
                    } else {
                        var cur = " " + (el.getAttribute('class') || '') + " ";
                        var tar = ' ' + cls + ' ';
                        while (cur.indexOf(tar) >= 0) {
                            cur = cur.replace(tar, ' ');
                        }
                        cur = cur.trim();
                        if (cur) {
                            el.setAttribute('class', cur);
                        } else {
                            el.removeAttribute('class');
                        }
                    }
                }

                /*  */

                function resolveTransition(def) {
                    if (!def) {
                        return
                    }
                    /* istanbul ignore else */
                    if (typeof def === 'object') {
                        var res = {};
                        if (def.css !== false) {
                            extend(res, autoCssTransition(def.name || 'v'));
                        }
                        extend(res, def);
                        return res
                    } else if (typeof def === 'string') {
                        return autoCssTransition(def)
                    }
                }

                var autoCssTransition = cached(function(name) {
                    return {
                        enterClass: (name + "-enter"),
                        enterToClass: (name + "-enter-to"),
                        enterActiveClass: (name + "-enter-active"),
                        leaveClass: (name + "-leave"),
                        leaveToClass: (name + "-leave-to"),
                        leaveActiveClass: (name + "-leave-active")
                    }
                });

                var hasTransition = inBrowser && !isIE9;
                var TRANSITION = 'transition';
                var ANIMATION = 'animation';

                // Transition property/event sniffing
                var transitionProp = 'transition';
                var transitionEndEvent = 'transitionend';
                var animationProp = 'animation';
                var animationEndEvent = 'animationend';
                if (hasTransition) {
                    /* istanbul ignore if */
                    if (window.ontransitionend === undefined &&
                        window.onwebkittransitionend !== undefined
                    ) {
                        transitionProp = 'WebkitTransition';
                        transitionEndEvent = 'webkitTransitionEnd';
                    }
                    if (window.onanimationend === undefined &&
                        window.onwebkitanimationend !== undefined
                    ) {
                        animationProp = 'WebkitAnimation';
                        animationEndEvent = 'webkitAnimationEnd';
                    }
                }

                // binding to window is necessary to make hot reload work in IE in strict mode
                var raf = inBrowser ?
                    window.requestAnimationFrame ?
                    window.requestAnimationFrame.bind(window) :
                    setTimeout :
                    /* istanbul ignore next */ function(fn) { return fn(); };

                function nextFrame(fn) {
                    raf(function() {
                        raf(fn);
                    });
                }

                function addTransitionClass(el, cls) {
                    var transitionClasses = el._transitionClasses || (el._transitionClasses = []);
                    if (transitionClasses.indexOf(cls) < 0) {
                        transitionClasses.push(cls);
                        addClass(el, cls);
                    }
                }

                function removeTransitionClass(el, cls) {
                    if (el._transitionClasses) {
                        remove(el._transitionClasses, cls);
                    }
                    removeClass(el, cls);
                }

                function whenTransitionEnds(
                    el,
                    expectedType,
                    cb
                ) {
                    var ref = getTransitionInfo(el, expectedType);
                    var type = ref.type;
                    var timeout = ref.timeout;
                    var propCount = ref.propCount;
                    if (!type) { return cb() }
                    var event = type === TRANSITION ? transitionEndEvent : animationEndEvent;
                    var ended = 0;
                    var end = function() {
                        el.removeEventListener(event, onEnd);
                        cb();
                    };
                    var onEnd = function(e) {
                        if (e.target === el) {
                            if (++ended >= propCount) {
                                end();
                            }
                        }
                    };
                    setTimeout(function() {
                        if (ended < propCount) {
                            end();
                        }
                    }, timeout + 1);
                    el.addEventListener(event, onEnd);
                }

                var transformRE = /\b(transform|all)(,|$)/;

                function getTransitionInfo(el, expectedType) {
                    var styles = window.getComputedStyle(el);
                    var transitionDelays = styles[transitionProp + 'Delay'].split(', ');
                    var transitionDurations = styles[transitionProp + 'Duration'].split(', ');
                    var transitionTimeout = getTimeout(transitionDelays, transitionDurations);
                    var animationDelays = styles[animationProp + 'Delay'].split(', ');
                    var animationDurations = styles[animationProp + 'Duration'].split(', ');
                    var animationTimeout = getTimeout(animationDelays, animationDurations);

                    var type;
                    var timeout = 0;
                    var propCount = 0;
                    /* istanbul ignore if */
                    if (expectedType === TRANSITION) {
                        if (transitionTimeout > 0) {
                            type = TRANSITION;
                            timeout = transitionTimeout;
                            propCount = transitionDurations.length;
                        }
                    } else if (expectedType === ANIMATION) {
                        if (animationTimeout > 0) {
                            type = ANIMATION;
                            timeout = animationTimeout;
                            propCount = animationDurations.length;
                        }
                    } else {
                        timeout = Math.max(transitionTimeout, animationTimeout);
                        type = timeout > 0 ?
                            transitionTimeout > animationTimeout ?
                            TRANSITION :
                            ANIMATION :
                            null;
                        propCount = type ?
                            type === TRANSITION ?
                            transitionDurations.length :
                            animationDurations.length :
                            0;
                    }
                    var hasTransform =
                        type === TRANSITION &&
                        transformRE.test(styles[transitionProp + 'Property']);
                    return {
                        type: type,
                        timeout: timeout,
                        propCount: propCount,
                        hasTransform: hasTransform
                    }
                }

                function getTimeout(delays, durations) {
                    /* istanbul ignore next */
                    while (delays.length < durations.length) {
                        delays = delays.concat(delays);
                    }

                    return Math.max.apply(null, durations.map(function(d, i) {
                        return toMs(d) + toMs(delays[i])
                    }))
                }

                function toMs(s) {
                    return Number(s.slice(0, -1)) * 1000
                }

                /*  */

                function enter(vnode, toggleDisplay) {
                    var el = vnode.elm;

                    // call leave callback now
                    if (isDef(el._leaveCb)) {
                        el._leaveCb.cancelled = true;
                        el._leaveCb();
                    }

                    var data = resolveTransition(vnode.data.transition);
                    if (isUndef(data)) {
                        return
                    }

                    /* istanbul ignore if */
                    if (isDef(el._enterCb) || el.nodeType !== 1) {
                        return
                    }

                    var css = data.css;
                    var type = data.type;
                    var enterClass = data.enterClass;
                    var enterToClass = data.enterToClass;
                    var enterActiveClass = data.enterActiveClass;
                    var appearClass = data.appearClass;
                    var appearToClass = data.appearToClass;
                    var appearActiveClass = data.appearActiveClass;
                    var beforeEnter = data.beforeEnter;
                    var enter = data.enter;
                    var afterEnter = data.afterEnter;
                    var enterCancelled = data.enterCancelled;
                    var beforeAppear = data.beforeAppear;
                    var appear = data.appear;
                    var afterAppear = data.afterAppear;
                    var appearCancelled = data.appearCancelled;
                    var duration = data.duration;

                    // activeInstance will always be the <transition> component managing this
                    // transition. One edge case to check is when the <transition> is placed
                    // as the root node of a child component. In that case we need to check
                    // <transition>'s parent for appear check.
                    var context = activeInstance;
                    var transitionNode = activeInstance.$vnode;
                    while (transitionNode && transitionNode.parent) {
                        transitionNode = transitionNode.parent;
                        context = transitionNode.context;
                    }

                    var isAppear = !context._isMounted || !vnode.isRootInsert;

                    if (isAppear && !appear && appear !== '') {
                        return
                    }

                    var startClass = isAppear && appearClass ?
                        appearClass :
                        enterClass;
                    var activeClass = isAppear && appearActiveClass ?
                        appearActiveClass :
                        enterActiveClass;
                    var toClass = isAppear && appearToClass ?
                        appearToClass :
                        enterToClass;

                    var beforeEnterHook = isAppear ?
                        (beforeAppear || beforeEnter) :
                        beforeEnter;
                    var enterHook = isAppear ?
                        (typeof appear === 'function' ? appear : enter) :
                        enter;
                    var afterEnterHook = isAppear ?
                        (afterAppear || afterEnter) :
                        afterEnter;
                    var enterCancelledHook = isAppear ?
                        (appearCancelled || enterCancelled) :
                        enterCancelled;

                    var explicitEnterDuration = toNumber(
                        isObject(duration) ?
                        duration.enter :
                        duration
                    );

                    if ("development" !== 'production' && explicitEnterDuration != null) {
                        checkDuration(explicitEnterDuration, 'enter', vnode);
                    }

                    var expectsCSS = css !== false && !isIE9;
                    var userWantsControl = getHookArgumentsLength(enterHook);

                    var cb = el._enterCb = once(function() {
                        if (expectsCSS) {
                            removeTransitionClass(el, toClass);
                            removeTransitionClass(el, activeClass);
                        }
                        if (cb.cancelled) {
                            if (expectsCSS) {
                                removeTransitionClass(el, startClass);
                            }
                            enterCancelledHook && enterCancelledHook(el);
                        } else {
                            afterEnterHook && afterEnterHook(el);
                        }
                        el._enterCb = null;
                    });

                    if (!vnode.data.show) {
                        // remove pending leave element on enter by injecting an insert hook
                        mergeVNodeHook(vnode, 'insert', function() {
                            var parent = el.parentNode;
                            var pendingNode = parent && parent._pending && parent._pending[vnode.key];
                            if (pendingNode &&
                                pendingNode.tag === vnode.tag &&
                                pendingNode.elm._leaveCb
                            ) {
                                pendingNode.elm._leaveCb();
                            }
                            enterHook && enterHook(el, cb);
                        });
                    }

                    // start enter transition
                    beforeEnterHook && beforeEnterHook(el);
                    if (expectsCSS) {
                        addTransitionClass(el, startClass);
                        addTransitionClass(el, activeClass);
                        nextFrame(function() {
                            removeTransitionClass(el, startClass);
                            if (!cb.cancelled) {
                                addTransitionClass(el, toClass);
                                if (!userWantsControl) {
                                    if (isValidDuration(explicitEnterDuration)) {
                                        setTimeout(cb, explicitEnterDuration);
                                    } else {
                                        whenTransitionEnds(el, type, cb);
                                    }
                                }
                            }
                        });
                    }

                    if (vnode.data.show) {
                        toggleDisplay && toggleDisplay();
                        enterHook && enterHook(el, cb);
                    }

                    if (!expectsCSS && !userWantsControl) {
                        cb();
                    }
                }

                function leave(vnode, rm) {
                    var el = vnode.elm;

                    // call enter callback now
                    if (isDef(el._enterCb)) {
                        el._enterCb.cancelled = true;
                        el._enterCb();
                    }

                    var data = resolveTransition(vnode.data.transition);
                    if (isUndef(data) || el.nodeType !== 1) {
                        return rm()
                    }

                    /* istanbul ignore if */
                    if (isDef(el._leaveCb)) {
                        return
                    }

                    var css = data.css;
                    var type = data.type;
                    var leaveClass = data.leaveClass;
                    var leaveToClass = data.leaveToClass;
                    var leaveActiveClass = data.leaveActiveClass;
                    var beforeLeave = data.beforeLeave;
                    var leave = data.leave;
                    var afterLeave = data.afterLeave;
                    var leaveCancelled = data.leaveCancelled;
                    var delayLeave = data.delayLeave;
                    var duration = data.duration;

                    var expectsCSS = css !== false && !isIE9;
                    var userWantsControl = getHookArgumentsLength(leave);

                    var explicitLeaveDuration = toNumber(
                        isObject(duration) ?
                        duration.leave :
                        duration
                    );

                    if ("development" !== 'production' && isDef(explicitLeaveDuration)) {
                        checkDuration(explicitLeaveDuration, 'leave', vnode);
                    }

                    var cb = el._leaveCb = once(function() {
                        if (el.parentNode && el.parentNode._pending) {
                            el.parentNode._pending[vnode.key] = null;
                        }
                        if (expectsCSS) {
                            removeTransitionClass(el, leaveToClass);
                            removeTransitionClass(el, leaveActiveClass);
                        }
                        if (cb.cancelled) {
                            if (expectsCSS) {
                                removeTransitionClass(el, leaveClass);
                            }
                            leaveCancelled && leaveCancelled(el);
                        } else {
                            rm();
                            afterLeave && afterLeave(el);
                        }
                        el._leaveCb = null;
                    });

                    if (delayLeave) {
                        delayLeave(performLeave);
                    } else {
                        performLeave();
                    }

                    function performLeave() {
                        // the delayed leave may have already been cancelled
                        if (cb.cancelled) {
                            return
                        }
                        // record leaving element
                        if (!vnode.data.show) {
                            (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key)] = vnode;
                        }
                        beforeLeave && beforeLeave(el);
                        if (expectsCSS) {
                            addTransitionClass(el, leaveClass);
                            addTransitionClass(el, leaveActiveClass);
                            nextFrame(function() {
                                removeTransitionClass(el, leaveClass);
                                if (!cb.cancelled) {
                                    addTransitionClass(el, leaveToClass);
                                    if (!userWantsControl) {
                                        if (isValidDuration(explicitLeaveDuration)) {
                                            setTimeout(cb, explicitLeaveDuration);
                                        } else {
                                            whenTransitionEnds(el, type, cb);
                                        }
                                    }
                                }
                            });
                        }
                        leave && leave(el, cb);
                        if (!expectsCSS && !userWantsControl) {
                            cb();
                        }
                    }
                }

                // only used in dev mode
                function checkDuration(val, name, vnode) {
                    if (typeof val !== 'number') {
                        warn(
                            "<transition> explicit " + name + " duration is not a valid number - " +
                            "got " + (JSON.stringify(val)) + ".",
                            vnode.context
                        );
                    } else if (isNaN(val)) {
                        warn(
                            "<transition> explicit " + name + " duration is NaN - " +
                            'the duration expression might be incorrect.',
                            vnode.context
                        );
                    }
                }

                function isValidDuration(val) {
                    return typeof val === 'number' && !isNaN(val)
                }

                /**
                 * Normalize a transition hook's argument length. The hook may be:
                 * - a merged hook (invoker) with the original in .fns
                 * - a wrapped component method (check ._length)
                 * - a plain function (.length)
                 */
                function getHookArgumentsLength(fn) {
                    if (isUndef(fn)) {
                        return false
                    }
                    var invokerFns = fn.fns;
                    if (isDef(invokerFns)) {
                        // invoker
                        return getHookArgumentsLength(
                            Array.isArray(invokerFns) ?
                            invokerFns[0] :
                            invokerFns
                        )
                    } else {
                        return (fn._length || fn.length) > 1
                    }
                }

                function _enter(_, vnode) {
                    if (vnode.data.show !== true) {
                        enter(vnode);
                    }
                }

                var transition = inBrowser ? {
                    create: _enter,
                    activate: _enter,
                    remove: function remove$$1(vnode, rm) {
                        /* istanbul ignore else */
                        if (vnode.data.show !== true) {
                            leave(vnode, rm);
                        } else {
                            rm();
                        }
                    }
                } : {}

                var platformModules = [
                    attrs,
                    klass,
                    events,
                    domProps,
                    style,
                    transition
                ]

                /*  */

                // the directive module should be applied last, after all
                // built-in modules have been applied.
                var modules = platformModules.concat(baseModules);

                var patch = createPatchFunction({ nodeOps: nodeOps, modules: modules });

                /**
                 * Not type checking this file because flow doesn't like attaching
                 * properties to Elements.
                 */

                /* istanbul ignore if */
                if (isIE9) {
                    // http://www.matts411.com/post/internet-explorer-9-oninput/
                    document.addEventListener('selectionchange', function() {
                        var el = document.activeElement;
                        if (el && el.vmodel) {
                            trigger(el, 'input');
                        }
                    });
                }

                var directive = {
                    inserted: function inserted(el, binding, vnode, oldVnode) {
                        if (vnode.tag === 'select') {
                            // #6903
                            if (oldVnode.elm && !oldVnode.elm._vOptions) {
                                mergeVNodeHook(vnode, 'postpatch', function() {
                                    directive.componentUpdated(el, binding, vnode);
                                });
                            } else {
                                setSelected(el, binding, vnode.context);
                            }
                            el._vOptions = [].map.call(el.options, getValue);
                        } else if (vnode.tag === 'textarea' || isTextInputType(el.type)) {
                            el._vModifiers = binding.modifiers;
                            if (!binding.modifiers.lazy) {
                                el.addEventListener('compositionstart', onCompositionStart);
                                el.addEventListener('compositionend', onCompositionEnd);
                                // Safari < 10.2 & UIWebView doesn't fire compositionend when
                                // switching focus before confirming composition choice
                                // this also fixes the issue where some browsers e.g. iOS Chrome
                                // fires "change" instead of "input" on autocomplete.
                                el.addEventListener('change', onCompositionEnd);
                                /* istanbul ignore if */
                                if (isIE9) {
                                    el.vmodel = true;
                                }
                            }
                        }
                    },

                    componentUpdated: function componentUpdated(el, binding, vnode) {
                        if (vnode.tag === 'select') {
                            setSelected(el, binding, vnode.context);
                            // in case the options rendered by v-for have changed,
                            // it's possible that the value is out-of-sync with the rendered options.
                            // detect such cases and filter out values that no longer has a matching
                            // option in the DOM.
                            var prevOptions = el._vOptions;
                            var curOptions = el._vOptions = [].map.call(el.options, getValue);
                            if (curOptions.some(function(o, i) { return !looseEqual(o, prevOptions[i]); })) {
                                // trigger change event if
                                // no matching option found for at least one value
                                var needReset = el.multiple ?
                                    binding.value.some(function(v) { return hasNoMatchingOption(v, curOptions); }) :
                                    binding.value !== binding.oldValue && hasNoMatchingOption(binding.value, curOptions);
                                if (needReset) {
                                    trigger(el, 'change');
                                }
                            }
                        }
                    }
                };

                function setSelected(el, binding, vm) {
                    actuallySetSelected(el, binding, vm);
                    /* istanbul ignore if */
                    if (isIE || isEdge) {
                        setTimeout(function() {
                            actuallySetSelected(el, binding, vm);
                        }, 0);
                    }
                }

                function actuallySetSelected(el, binding, vm) {
                    var value = binding.value;
                    var isMultiple = el.multiple;
                    if (isMultiple && !Array.isArray(value)) {
                        "development" !== 'production' && warn(
                            "<select multiple v-model=\"" + (binding.expression) + "\"> " +
                            "expects an Array value for its binding, but got " + (Object.prototype.toString.call(value).slice(8, -1)),
                            vm
                        );
                        return
                    }
                    var selected, option;
                    for (var i = 0, l = el.options.length; i < l; i++) {
                        option = el.options[i];
                        if (isMultiple) {
                            selected = looseIndexOf(value, getValue(option)) > -1;
                            if (option.selected !== selected) {
                                option.selected = selected;
                            }
                        } else {
                            if (looseEqual(getValue(option), value)) {
                                if (el.selectedIndex !== i) {
                                    el.selectedIndex = i;
                                }
                                return
                            }
                        }
                    }
                    if (!isMultiple) {
                        el.selectedIndex = -1;
                    }
                }

                function hasNoMatchingOption(value, options) {
                    return options.every(function(o) { return !looseEqual(o, value); })
                }

                function getValue(option) {
                    return '_value' in option ?
                        option._value :
                        option.value
                }

                function onCompositionStart(e) {
                    e.target.composing = true;
                }

                function onCompositionEnd(e) {
                    // prevent triggering an input event for no reason
                    if (!e.target.composing) { return }
                    e.target.composing = false;
                    trigger(e.target, 'input');
                }

                function trigger(el, type) {
                    var e = document.createEvent('HTMLEvents');
                    e.initEvent(type, true, true);
                    el.dispatchEvent(e);
                }

                /*  */

                // recursively search for possible transition defined inside the component root
                function locateNode(vnode) {
                    return vnode.componentInstance && (!vnode.data || !vnode.data.transition) ?
                        locateNode(vnode.componentInstance._vnode) :
                        vnode
                }

                var show = {
                    bind: function bind(el, ref, vnode) {
                        var value = ref.value;

                        vnode = locateNode(vnode);
                        var transition$$1 = vnode.data && vnode.data.transition;
                        var originalDisplay = el.__vOriginalDisplay =
                            el.style.display === 'none' ? '' : el.style.display;
                        if (value && transition$$1) {
                            vnode.data.show = true;
                            enter(vnode, function() {
                                el.style.display = originalDisplay;
                            });
                        } else {
                            el.style.display = value ? originalDisplay : 'none';
                        }
                    },

                    update: function update(el, ref, vnode) {
                        var value = ref.value;
                        var oldValue = ref.oldValue;

                        /* istanbul ignore if */
                        if (!value === !oldValue) { return }
                        vnode = locateNode(vnode);
                        var transition$$1 = vnode.data && vnode.data.transition;
                        if (transition$$1) {
                            vnode.data.show = true;
                            if (value) {
                                enter(vnode, function() {
                                    el.style.display = el.__vOriginalDisplay;
                                });
                            } else {
                                leave(vnode, function() {
                                    el.style.display = 'none';
                                });
                            }
                        } else {
                            el.style.display = value ? el.__vOriginalDisplay : 'none';
                        }
                    },

                    unbind: function unbind(
                        el,
                        binding,
                        vnode,
                        oldVnode,
                        isDestroy
                    ) {
                        if (!isDestroy) {
                            el.style.display = el.__vOriginalDisplay;
                        }
                    }
                }

                var platformDirectives = {
                    model: directive,
                    show: show
                }

                /*  */

                // Provides transition support for a single element/component.
                // supports transition mode (out-in / in-out)

                var transitionProps = {
                    name: String,
                    appear: Boolean,
                    css: Boolean,
                    mode: String,
                    type: String,
                    enterClass: String,
                    leaveClass: String,
                    enterToClass: String,
                    leaveToClass: String,
                    enterActiveClass: String,
                    leaveActiveClass: String,
                    appearClass: String,
                    appearActiveClass: String,
                    appearToClass: String,
                    duration: [Number, String, Object]
                };

                // in case the child is also an abstract component, e.g. <keep-alive>
                // we want to recursively retrieve the real component to be rendered
                function getRealChild(vnode) {
                    var compOptions = vnode && vnode.componentOptions;
                    if (compOptions && compOptions.Ctor.options.abstract) {
                        return getRealChild(getFirstComponentChild(compOptions.children))
                    } else {
                        return vnode
                    }
                }

                function extractTransitionData(comp) {
                    var data = {};
                    var options = comp.$options;
                    // props
                    for (var key in options.propsData) {
                        data[key] = comp[key];
                    }
                    // events.
                    // extract listeners and pass them directly to the transition methods
                    var listeners = options._parentListeners;
                    for (var key$1 in listeners) {
                        data[camelize(key$1)] = listeners[key$1];
                    }
                    return data
                }

                function placeholder(h, rawChild) {
                    if (/\d-keep-alive$/.test(rawChild.tag)) {
                        return h('keep-alive', {
                            props: rawChild.componentOptions.propsData
                        })
                    }
                }

                function hasParentTransition(vnode) {
                    while ((vnode = vnode.parent)) {
                        if (vnode.data.transition) {
                            return true
                        }
                    }
                }

                function isSameChild(child, oldChild) {
                    return oldChild.key === child.key && oldChild.tag === child.tag
                }

                var Transition = {
                    name: 'transition',
                    props: transitionProps,
                    abstract: true,

                    render: function render(h) {
                        var this$1 = this;

                        var children = this.$slots.default;
                        if (!children) {
                            return
                        }

                        // filter out text nodes (possible whitespaces)
                        children = children.filter(function(c) { return c.tag || isAsyncPlaceholder(c); });
                        /* istanbul ignore if */
                        if (!children.length) {
                            return
                        }

                        // warn multiple elements
                        if ("development" !== 'production' && children.length > 1) {
                            warn(
                                '<transition> can only be used on a single element. Use ' +
                                '<transition-group> for lists.',
                                this.$parent
                            );
                        }

                        var mode = this.mode;

                        // warn invalid mode
                        if ("development" !== 'production' &&
                            mode && mode !== 'in-out' && mode !== 'out-in'
                        ) {
                            warn(
                                'invalid <transition> mode: ' + mode,
                                this.$parent
                            );
                        }

                        var rawChild = children[0];

                        // if this is a component root node and the component's
                        // parent container node also has transition, skip.
                        if (hasParentTransition(this.$vnode)) {
                            return rawChild
                        }

                        // apply transition data to child
                        // use getRealChild() to ignore abstract components e.g. keep-alive
                        var child = getRealChild(rawChild);
                        /* istanbul ignore if */
                        if (!child) {
                            return rawChild
                        }

                        if (this._leaving) {
                            return placeholder(h, rawChild)
                        }

                        // ensure a key that is unique to the vnode type and to this transition
                        // component instance. This key will be used to remove pending leaving nodes
                        // during entering.
                        var id = "__transition-" + (this._uid) + "-";
                        child.key = child.key == null ?
                            child.isComment ?
                            id + 'comment' :
                            id + child.tag :
                            isPrimitive(child.key) ?
                            (String(child.key).indexOf(id) === 0 ? child.key : id + child.key) :
                            child.key;

                        var data = (child.data || (child.data = {})).transition = extractTransitionData(this);
                        var oldRawChild = this._vnode;
                        var oldChild = getRealChild(oldRawChild);

                        // mark v-show
                        // so that the transition module can hand over the control to the directive
                        if (child.data.directives && child.data.directives.some(function(d) { return d.name === 'show'; })) {
                            child.data.show = true;
                        }

                        if (
                            oldChild &&
                            oldChild.data &&
                            !isSameChild(child, oldChild) &&
                            !isAsyncPlaceholder(oldChild) &&
                            // #6687 component root is a comment node
                            !(oldChild.componentInstance && oldChild.componentInstance._vnode.isComment)
                        ) {
                            // replace old child transition data with fresh one
                            // important for dynamic transitions!
                            var oldData = oldChild.data.transition = extend({}, data);
                            // handle transition mode
                            if (mode === 'out-in') {
                                // return placeholder node and queue update when leave finishes
                                this._leaving = true;
                                mergeVNodeHook(oldData, 'afterLeave', function() {
                                    this$1._leaving = false;
                                    this$1.$forceUpdate();
                                });
                                return placeholder(h, rawChild)
                            } else if (mode === 'in-out') {
                                if (isAsyncPlaceholder(child)) {
                                    return oldRawChild
                                }
                                var delayedLeave;
                                var performLeave = function() { delayedLeave(); };
                                mergeVNodeHook(data, 'afterEnter', performLeave);
                                mergeVNodeHook(data, 'enterCancelled', performLeave);
                                mergeVNodeHook(oldData, 'delayLeave', function(leave) { delayedLeave = leave; });
                            }
                        }

                        return rawChild
                    }
                }

                /*  */

                // Provides transition support for list items.
                // supports move transitions using the FLIP technique.

                // Because the vdom's children update algorithm is "unstable" - i.e.
                // it doesn't guarantee the relative positioning of removed elements,
                // we force transition-group to update its children into two passes:
                // in the first pass, we remove all nodes that need to be removed,
                // triggering their leaving transition; in the second pass, we insert/move
                // into the final desired state. This way in the second pass removed
                // nodes will remain where they should be.

                var props = extend({
                    tag: String,
                    moveClass: String
                }, transitionProps);

                delete props.mode;

                var TransitionGroup = {
                    props: props,

                    render: function render(h) {
                        var tag = this.tag || this.$vnode.data.tag || 'span';
                        var map = Object.create(null);
                        var prevChildren = this.prevChildren = this.children;
                        var rawChildren = this.$slots.default || [];
                        var children = this.children = [];
                        var transitionData = extractTransitionData(this);

                        for (var i = 0; i < rawChildren.length; i++) {
                            var c = rawChildren[i];
                            if (c.tag) {
                                if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {
                                    children.push(c);
                                    map[c.key] = c;
                                    (c.data || (c.data = {})).transition = transitionData;
                                } else {
                                    var opts = c.componentOptions;
                                    var name = opts ? (opts.Ctor.options.name || opts.tag || '') : c.tag;
                                    warn(("<transition-group> children must be keyed: <" + name + ">"));
                                }
                            }
                        }

                        if (prevChildren) {
                            var kept = [];
                            var removed = [];
                            for (var i$1 = 0; i$1 < prevChildren.length; i$1++) {
                                var c$1 = prevChildren[i$1];
                                c$1.data.transition = transitionData;
                                c$1.data.pos = c$1.elm.getBoundingClientRect();
                                if (map[c$1.key]) {
                                    kept.push(c$1);
                                } else {
                                    removed.push(c$1);
                                }
                            }
                            this.kept = h(tag, null, kept);
                            this.removed = removed;
                        }

                        return h(tag, null, children)
                    },

                    beforeUpdate: function beforeUpdate() {
                        // force removing pass
                        this.__patch__(
                            this._vnode,
                            this.kept,
                            false, // hydrating
                            true // removeOnly (!important, avoids unnecessary moves)
                        );
                        this._vnode = this.kept;
                    },

                    updated: function updated() {
                        var children = this.prevChildren;
                        var moveClass = this.moveClass || ((this.name || 'v') + '-move');
                        if (!children.length || !this.hasMove(children[0].elm, moveClass)) {
                            return
                        }

                        // we divide the work into three loops to avoid mixing DOM reads and writes
                        // in each iteration - which helps prevent layout thrashing.
                        children.forEach(callPendingCbs);
                        children.forEach(recordPosition);
                        children.forEach(applyTranslation);

                        // force reflow to put everything in position
                        // assign to this to avoid being removed in tree-shaking
                        // $flow-disable-line
                        this._reflow = document.body.offsetHeight;

                        children.forEach(function(c) {
                            if (c.data.moved) {
                                var el = c.elm;
                                var s = el.style;
                                addTransitionClass(el, moveClass);
                                s.transform = s.WebkitTransform = s.transitionDuration = '';
                                el.addEventListener(transitionEndEvent, el._moveCb = function cb(e) {
                                    if (!e || /transform$/.test(e.propertyName)) {
                                        el.removeEventListener(transitionEndEvent, cb);
                                        el._moveCb = null;
                                        removeTransitionClass(el, moveClass);
                                    }
                                });
                            }
                        });
                    },

                    methods: {
                        hasMove: function hasMove(el, moveClass) {
                            /* istanbul ignore if */
                            if (!hasTransition) {
                                return false
                            }
                            /* istanbul ignore if */
                            if (this._hasMove) {
                                return this._hasMove
                            }
                            // Detect whether an element with the move class applied has
                            // CSS transitions. Since the element may be inside an entering
                            // transition at this very moment, we make a clone of it and remove
                            // all other transition classes applied to ensure only the move class
                            // is applied.
                            var clone = el.cloneNode();
                            if (el._transitionClasses) {
                                el._transitionClasses.forEach(function(cls) { removeClass(clone, cls); });
                            }
                            addClass(clone, moveClass);
                            clone.style.display = 'none';
                            this.$el.appendChild(clone);
                            var info = getTransitionInfo(clone);
                            this.$el.removeChild(clone);
                            return (this._hasMove = info.hasTransform)
                        }
                    }
                }

                function callPendingCbs(c) {
                    /* istanbul ignore if */
                    if (c.elm._moveCb) {
                        c.elm._moveCb();
                    }
                    /* istanbul ignore if */
                    if (c.elm._enterCb) {
                        c.elm._enterCb();
                    }
                }

                function recordPosition(c) {
                    c.data.newPos = c.elm.getBoundingClientRect();
                }

                function applyTranslation(c) {
                    var oldPos = c.data.pos;
                    var newPos = c.data.newPos;
                    var dx = oldPos.left - newPos.left;
                    var dy = oldPos.top - newPos.top;
                    if (dx || dy) {
                        c.data.moved = true;
                        var s = c.elm.style;
                        s.transform = s.WebkitTransform = "translate(" + dx + "px," + dy + "px)";
                        s.transitionDuration = '0s';
                    }
                }

                var platformComponents = {
                    Transition: Transition,
                    TransitionGroup: TransitionGroup
                }

                /*  */

                // install platform specific utils
                Vue.config.mustUseProp = mustUseProp;
                Vue.config.isReservedTag = isReservedTag;
                Vue.config.isReservedAttr = isReservedAttr;
                Vue.config.getTagNamespace = getTagNamespace;
                Vue.config.isUnknownElement = isUnknownElement;

                // install platform runtime directives & components
                extend(Vue.options.directives, platformDirectives);
                extend(Vue.options.components, platformComponents);

                // install platform patch function
                Vue.prototype.__patch__ = inBrowser ? patch : noop;

                // public mount method
                Vue.prototype.$mount = function(
                    el,
                    hydrating
                ) {
                    el = el && inBrowser ? query(el) : undefined;
                    return mountComponent(this, el, hydrating)
                };

                // devtools global hook
                /* istanbul ignore next */
                if (inBrowser) {
                    setTimeout(function() {
                        if (config.devtools) {
                            if (devtools) {
                                devtools.emit('init', Vue);
                            } else if (
                                "development" !== 'production' &&
                                "development" !== 'test' &&
                                isChrome
                            ) {
                                console[console.info ? 'info' : 'log'](
                                    'Download the Vue Devtools extension for a better development experience:\n' +
                                    'https://github.com/vuejs/vue-devtools'
                                );
                            }
                        }
                        if ("development" !== 'production' &&
                            "development" !== 'test' &&
                            config.productionTip !== false &&
                            typeof console !== 'undefined'
                        ) {
                            console[console.info ? 'info' : 'log'](
                                "You are running Vue in development mode.\n" +
                                "Make sure to turn on production mode when deploying for production.\n" +
                                "See more tips at https://vuejs.org/guide/deployment.html"
                            );
                        }
                    }, 0);
                }

                /*  */

                var defaultTagRE = /\{\{((?:.|\n)+?)\}\}/g;
                var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;

                var buildRegex = cached(function(delimiters) {
                    var open = delimiters[0].replace(regexEscapeRE, '\\$&');
                    var close = delimiters[1].replace(regexEscapeRE, '\\$&');
                    return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
                });



                function parseText(
                    text,
                    delimiters
                ) {
                    var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;
                    if (!tagRE.test(text)) {
                        return
                    }
                    var tokens = [];
                    var rawTokens = [];
                    var lastIndex = tagRE.lastIndex = 0;
                    var match, index, tokenValue;
                    while ((match = tagRE.exec(text))) {
                        index = match.index;
                        // push text token
                        if (index > lastIndex) {
                            rawTokens.push(tokenValue = text.slice(lastIndex, index));
                            tokens.push(JSON.stringify(tokenValue));
                        }
                        // tag token
                        var exp = parseFilters(match[1].trim());
                        tokens.push(("_s(" + exp + ")"));
                        rawTokens.push({ '@binding': exp });
                        lastIndex = index + match[0].length;
                    }
                    if (lastIndex < text.length) {
                        rawTokens.push(tokenValue = text.slice(lastIndex));
                        tokens.push(JSON.stringify(tokenValue));
                    }
                    return {
                        expression: tokens.join('+'),
                        tokens: rawTokens
                    }
                }

                /*  */

                function transformNode(el, options) {
                    var warn = options.warn || baseWarn;
                    var staticClass = getAndRemoveAttr(el, 'class');
                    if ("development" !== 'production' && staticClass) {
                        var res = parseText(staticClass, options.delimiters);
                        if (res) {
                            warn(
                                "class=\"" + staticClass + "\": " +
                                'Interpolation inside attributes has been removed. ' +
                                'Use v-bind or the colon shorthand instead. For example, ' +
                                'instead of <div class="{{ val }}">, use <div :class="val">.'
                            );
                        }
                    }
                    if (staticClass) {
                        el.staticClass = JSON.stringify(staticClass);
                    }
                    var classBinding = getBindingAttr(el, 'class', false /* getStatic */ );
                    if (classBinding) {
                        el.classBinding = classBinding;
                    }
                }

                function genData(el) {
                    var data = '';
                    if (el.staticClass) {
                        data += "staticClass:" + (el.staticClass) + ",";
                    }
                    if (el.classBinding) {
                        data += "class:" + (el.classBinding) + ",";
                    }
                    return data
                }

                var klass$1 = {
                    staticKeys: ['staticClass'],
                    transformNode: transformNode,
                    genData: genData
                }

                /*  */

                function transformNode$1(el, options) {
                    var warn = options.warn || baseWarn;
                    var staticStyle = getAndRemoveAttr(el, 'style');
                    if (staticStyle) {
                        /* istanbul ignore if */
                        {
                            var res = parseText(staticStyle, options.delimiters);
                            if (res) {
                                warn(
                                    "style=\"" + staticStyle + "\": " +
                                    'Interpolation inside attributes has been removed. ' +
                                    'Use v-bind or the colon shorthand instead. For example, ' +
                                    'instead of <div style="{{ val }}">, use <div :style="val">.'
                                );
                            }
                        }
                        el.staticStyle = JSON.stringify(parseStyleText(staticStyle));
                    }

                    var styleBinding = getBindingAttr(el, 'style', false /* getStatic */ );
                    if (styleBinding) {
                        el.styleBinding = styleBinding;
                    }
                }

                function genData$1(el) {
                    var data = '';
                    if (el.staticStyle) {
                        data += "staticStyle:" + (el.staticStyle) + ",";
                    }
                    if (el.styleBinding) {
                        data += "style:(" + (el.styleBinding) + "),";
                    }
                    return data
                }

                var style$1 = {
                    staticKeys: ['staticStyle'],
                    transformNode: transformNode$1,
                    genData: genData$1
                }

                /*  */

                var decoder;

                var he = {
                    decode: function decode(html) {
                        decoder = decoder || document.createElement('div');
                        decoder.innerHTML = html;
                        return decoder.textContent
                    }
                }

                /*  */

                var isUnaryTag = makeMap(
                    'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +
                    'link,meta,param,source,track,wbr'
                );

                // Elements that you can, intentionally, leave open
                // (and which close themselves)
                var canBeLeftOpenTag = makeMap(
                    'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source'
                );

                // HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
                // Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
                var isNonPhrasingTag = makeMap(
                    'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
                    'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
                    'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
                    'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
                    'title,tr,track'
                );

                /**
                 * Not type-checking this file because it's mostly vendor code.
                 */

                /*!
                 * HTML Parser By John Resig (ejohn.org)
                 * Modified by Juriy "kangax" Zaytsev
                 * Original code by Erik Arvidsson, Mozilla Public License
                 * http://erik.eae.net/simplehtmlparser/simplehtmlparser.js
                 */

                // Regular Expressions for parsing tags and attributes
                var attribute = /^\s*([^\s"'<>\/=]+)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
                // could use https://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-QName
                // but for Vue templates we can enforce a simple charset
                var ncname = '[a-zA-Z_][\\w\\-\\.]*';
                var qnameCapture = "((?:" + ncname + "\\:)?" + ncname + ")";
                var startTagOpen = new RegExp(("^<" + qnameCapture));
                var startTagClose = /^\s*(\/?)>/;
                var endTag = new RegExp(("^<\\/" + qnameCapture + "[^>]*>"));
                var doctype = /^<!DOCTYPE [^>]+>/i;
                // #7298: escape - to avoid being pased as HTML comment when inlined in page
                var comment = /^<!\--/;
                var conditionalComment = /^<!\[/;

                var IS_REGEX_CAPTURING_BROKEN = false;
                'x'.replace(/x(.)?/g, function(m, g) {
                    IS_REGEX_CAPTURING_BROKEN = g === '';
                });

                // Special Elements (can contain anything)
                var isPlainTextElement = makeMap('script,style,textarea', true);
                var reCache = {};

                var decodingMap = {
                    '&lt;': '<',
                    '&gt;': '>',
                    '&quot;': '"',
                    '&amp;': '&',
                    '&#10;': '\n',
                    '&#9;': '\t'
                };
                var encodedAttr = /&(?:lt|gt|quot|amp);/g;
                var encodedAttrWithNewLines = /&(?:lt|gt|quot|amp|#10|#9);/g;

                // #5992
                var isIgnoreNewlineTag = makeMap('pre,textarea', true);
                var shouldIgnoreFirstNewline = function(tag, html) { return tag && isIgnoreNewlineTag(tag) && html[0] === '\n'; };

                function decodeAttr(value, shouldDecodeNewlines) {
                    var re = shouldDecodeNewlines ? encodedAttrWithNewLines : encodedAttr;
                    return value.replace(re, function(match) { return decodingMap[match]; })
                }

                function parseHTML(html, options) {
                    var stack = [];
                    var expectHTML = options.expectHTML;
                    var isUnaryTag$$1 = options.isUnaryTag || no;
                    var canBeLeftOpenTag$$1 = options.canBeLeftOpenTag || no;
                    var index = 0;
                    var last, lastTag;
                    while (html) {
                        last = html;
                        // Make sure we're not in a plaintext content element like script/style
                        if (!lastTag || !isPlainTextElement(lastTag)) {
                            var textEnd = html.indexOf('<');
                            if (textEnd === 0) {
                                // Comment:
                                if (comment.test(html)) {
                                    var commentEnd = html.indexOf('-->');

                                    if (commentEnd >= 0) {
                                        if (options.shouldKeepComment) {
                                            options.comment(html.substring(4, commentEnd));
                                        }
                                        advance(commentEnd + 3);
                                        continue
                                    }
                                }

                                // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
                                if (conditionalComment.test(html)) {
                                    var conditionalEnd = html.indexOf(']>');

                                    if (conditionalEnd >= 0) {
                                        advance(conditionalEnd + 2);
                                        continue
                                    }
                                }

                                // Doctype:
                                var doctypeMatch = html.match(doctype);
                                if (doctypeMatch) {
                                    advance(doctypeMatch[0].length);
                                    continue
                                }

                                // End tag:
                                var endTagMatch = html.match(endTag);
                                if (endTagMatch) {
                                    var curIndex = index;
                                    advance(endTagMatch[0].length);
                                    parseEndTag(endTagMatch[1], curIndex, index);
                                    continue
                                }

                                // Start tag:
                                var startTagMatch = parseStartTag();
                                if (startTagMatch) {
                                    handleStartTag(startTagMatch);
                                    if (shouldIgnoreFirstNewline(lastTag, html)) {
                                        advance(1);
                                    }
                                    continue
                                }
                            }

                            var text = (void 0),
                                rest = (void 0),
                                next = (void 0);
                            if (textEnd >= 0) {
                                rest = html.slice(textEnd);
                                while (!endTag.test(rest) &&
                                    !startTagOpen.test(rest) &&
                                    !comment.test(rest) &&
                                    !conditionalComment.test(rest)
                                ) {
                                    // < in plain text, be forgiving and treat it as text
                                    next = rest.indexOf('<', 1);
                                    if (next < 0) { break }
                                    textEnd += next;
                                    rest = html.slice(textEnd);
                                }
                                text = html.substring(0, textEnd);
                                advance(textEnd);
                            }

                            if (textEnd < 0) {
                                text = html;
                                html = '';
                            }

                            if (options.chars && text) {
                                options.chars(text);
                            }
                        } else {
                            var endTagLength = 0;
                            var stackedTag = lastTag.toLowerCase();
                            var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'));
                            var rest$1 = html.replace(reStackedTag, function(all, text, endTag) {
                                endTagLength = endTag.length;
                                if (!isPlainTextElement(stackedTag) && stackedTag !== 'noscript') {
                                    text = text
                                        .replace(/<!\--([\s\S]*?)-->/g, '$1') // #7298
                                        .replace(/<!\[CDATA\[([\s\S]*?)]]>/g, '$1');
                                }
                                if (shouldIgnoreFirstNewline(stackedTag, text)) {
                                    text = text.slice(1);
                                }
                                if (options.chars) {
                                    options.chars(text);
                                }
                                return ''
                            });
                            index += html.length - rest$1.length;
                            html = rest$1;
                            parseEndTag(stackedTag, index - endTagLength, index);
                        }

                        if (html === last) {
                            options.chars && options.chars(html);
                            if ("development" !== 'production' && !stack.length && options.warn) {
                                options.warn(("Mal-formatted tag at end of template: \"" + html + "\""));
                            }
                            break
                        }
                    }

                    // Clean up any remaining tags
                    parseEndTag();

                    function advance(n) {
                        index += n;
                        html = html.substring(n);
                    }

                    function parseStartTag() {
                        var start = html.match(startTagOpen);
                        if (start) {
                            var match = {
                                tagName: start[1],
                                attrs: [],
                                start: index
                            };
                            advance(start[0].length);
                            var end, attr;
                            while (!(end = html.match(startTagClose)) && (attr = html.match(attribute))) {
                                advance(attr[0].length);
                                match.attrs.push(attr);
                            }
                            if (end) {
                                match.unarySlash = end[1];
                                advance(end[0].length);
                                match.end = index;
                                return match
                            }
                        }
                    }

                    function handleStartTag(match) {
                        var tagName = match.tagName;
                        var unarySlash = match.unarySlash;

                        if (expectHTML) {
                            if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
                                parseEndTag(lastTag);
                            }
                            if (canBeLeftOpenTag$$1(tagName) && lastTag === tagName) {
                                parseEndTag(tagName);
                            }
                        }

                        var unary = isUnaryTag$$1(tagName) || !!unarySlash;

                        var l = match.attrs.length;
                        var attrs = new Array(l);
                        for (var i = 0; i < l; i++) {
                            var args = match.attrs[i];
                            // hackish work around FF bug https://bugzilla.mozilla.org/show_bug.cgi?id=369778
                            if (IS_REGEX_CAPTURING_BROKEN && args[0].indexOf('""') === -1) {
                                if (args[3] === '') { delete args[3]; }
                                if (args[4] === '') { delete args[4]; }
                                if (args[5] === '') { delete args[5]; }
                            }
                            var value = args[3] || args[4] || args[5] || '';
                            var shouldDecodeNewlines = tagName === 'a' && args[1] === 'href' ?
                                options.shouldDecodeNewlinesForHref :
                                options.shouldDecodeNewlines;
                            attrs[i] = {
                                name: args[1],
                                value: decodeAttr(value, shouldDecodeNewlines)
                            };
                        }

                        if (!unary) {
                            stack.push({ tag: tagName, lowerCasedTag: tagName.toLowerCase(), attrs: attrs });
                            lastTag = tagName;
                        }

                        if (options.start) {
                            options.start(tagName, attrs, unary, match.start, match.end);
                        }
                    }

                    function parseEndTag(tagName, start, end) {
                        var pos, lowerCasedTagName;
                        if (start == null) { start = index; }
                        if (end == null) { end = index; }

                        if (tagName) {
                            lowerCasedTagName = tagName.toLowerCase();
                        }

                        // Find the closest opened tag of the same type
                        if (tagName) {
                            for (pos = stack.length - 1; pos >= 0; pos--) {
                                if (stack[pos].lowerCasedTag === lowerCasedTagName) {
                                    break
                                }
                            }
                        } else {
                            // If no tag name is provided, clean shop
                            pos = 0;
                        }

                        if (pos >= 0) {
                            // Close all the open elements, up the stack
                            for (var i = stack.length - 1; i >= pos; i--) {
                                if ("development" !== 'production' &&
                                    (i > pos || !tagName) &&
                                    options.warn
                                ) {
                                    options.warn(
                                        ("tag <" + (stack[i].tag) + "> has no matching end tag.")
                                    );
                                }
                                if (options.end) {
                                    options.end(stack[i].tag, start, end);
                                }
                            }

                            // Remove the open elements from the stack
                            stack.length = pos;
                            lastTag = pos && stack[pos - 1].tag;
                        } else if (lowerCasedTagName === 'br') {
                            if (options.start) {
                                options.start(tagName, [], true, start, end);
                            }
                        } else if (lowerCasedTagName === 'p') {
                            if (options.start) {
                                options.start(tagName, [], false, start, end);
                            }
                            if (options.end) {
                                options.end(tagName, start, end);
                            }
                        }
                    }
                }

                /*  */

                var onRE = /^@|^v-on:/;
                var dirRE = /^v-|^@|^:/;
                var forAliasRE = /([^]*?)\s+(?:in|of)\s+([^]*)/;
                var forIteratorRE = /,([^,\}\]]*)(?:,([^,\}\]]*))?$/;
                var stripParensRE = /^\(|\)$/g;

                var argRE = /:(.*)$/;
                var bindRE = /^:|^v-bind:/;
                var modifierRE = /\.[^.]+/g;

                var decodeHTMLCached = cached(he.decode);

                // configurable state
                var warn$2;
                var delimiters;
                var transforms;
                var preTransforms;
                var postTransforms;
                var platformIsPreTag;
                var platformMustUseProp;
                var platformGetTagNamespace;



                function createASTElement(
                    tag,
                    attrs,
                    parent
                ) {
                    return {
                        type: 1,
                        tag: tag,
                        attrsList: attrs,
                        attrsMap: makeAttrsMap(attrs),
                        parent: parent,
                        children: []
                    }
                }

                /**
                 * Convert HTML string to AST.
                 */
                function parse(
                    template,
                    options
                ) {
                    warn$2 = options.warn || baseWarn;

                    platformIsPreTag = options.isPreTag || no;
                    platformMustUseProp = options.mustUseProp || no;
                    platformGetTagNamespace = options.getTagNamespace || no;

                    transforms = pluckModuleFunction(options.modules, 'transformNode');
                    preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');
                    postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');

                    delimiters = options.delimiters;

                    var stack = [];
                    var preserveWhitespace = options.preserveWhitespace !== false;
                    var root;
                    var currentParent;
                    var inVPre = false;
                    var inPre = false;
                    var warned = false;

                    function warnOnce(msg) {
                        if (!warned) {
                            warned = true;
                            warn$2(msg);
                        }
                    }

                    function closeElement(element) {
                        // check pre state
                        if (element.pre) {
                            inVPre = false;
                        }
                        if (platformIsPreTag(element.tag)) {
                            inPre = false;
                        }
                        // apply post-transforms
                        for (var i = 0; i < postTransforms.length; i++) {
                            postTransforms[i](element, options);
                        }
                    }

                    parseHTML(template, {
                        warn: warn$2,
                        expectHTML: options.expectHTML,
                        isUnaryTag: options.isUnaryTag,
                        canBeLeftOpenTag: options.canBeLeftOpenTag,
                        shouldDecodeNewlines: options.shouldDecodeNewlines,
                        shouldDecodeNewlinesForHref: options.shouldDecodeNewlinesForHref,
                        shouldKeepComment: options.comments,
                        start: function start(tag, attrs, unary) {
                            // check namespace.
                            // inherit parent ns if there is one
                            var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);

                            // handle IE svg bug
                            /* istanbul ignore if */
                            if (isIE && ns === 'svg') {
                                attrs = guardIESVGBug(attrs);
                            }

                            var element = createASTElement(tag, attrs, currentParent);
                            if (ns) {
                                element.ns = ns;
                            }

                            if (isForbiddenTag(element) && !isServerRendering()) {
                                element.forbidden = true;
                                "development" !== 'production' && warn$2(
                                    'Templates should only be responsible for mapping the state to the ' +
                                    'UI. Avoid placing tags with side-effects in your templates, such as ' +
                                    "<" + tag + ">" + ', as they will not be parsed.'
                                );
                            }

                            // apply pre-transforms
                            for (var i = 0; i < preTransforms.length; i++) {
                                element = preTransforms[i](element, options) || element;
                            }

                            if (!inVPre) {
                                processPre(element);
                                if (element.pre) {
                                    inVPre = true;
                                }
                            }
                            if (platformIsPreTag(element.tag)) {
                                inPre = true;
                            }
                            if (inVPre) {
                                processRawAttrs(element);
                            } else if (!element.processed) {
                                // structural directives
                                processFor(element);
                                processIf(element);
                                processOnce(element);
                                // element-scope stuff
                                processElement(element, options);
                            }

                            function checkRootConstraints(el) {
                                {
                                    if (el.tag === 'slot' || el.tag === 'template') {
                                        warnOnce(
                                            "Cannot use <" + (el.tag) + "> as component root element because it may " +
                                            'contain multiple nodes.'
                                        );
                                    }
                                    if (el.attrsMap.hasOwnProperty('v-for')) {
                                        warnOnce(
                                            'Cannot use v-for on stateful component root element because ' +
                                            'it renders multiple elements.'
                                        );
                                    }
                                }
                            }

                            // tree management
                            if (!root) {
                                root = element;
                                checkRootConstraints(root);
                            } else if (!stack.length) {
                                // allow root elements with v-if, v-else-if and v-else
                                if (root.if && (element.elseif || element.else)) {
                                    checkRootConstraints(element);
                                    addIfCondition(root, {
                                        exp: element.elseif,
                                        block: element
                                    });
                                } else {
                                    warnOnce(
                                        "Component template should contain exactly one root element. " +
                                        "If you are using v-if on multiple elements, " +
                                        "use v-else-if to chain them instead."
                                    );
                                }
                            }
                            if (currentParent && !element.forbidden) {
                                if (element.elseif || element.else) {
                                    processIfConditions(element, currentParent);
                                } else if (element.slotScope) { // scoped slot
                                    currentParent.plain = false;
                                    var name = element.slotTarget || '"default"';
                                    (currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;
                                } else {
                                    currentParent.children.push(element);
                                    element.parent = currentParent;
                                }
                            }
                            if (!unary) {
                                currentParent = element;
                                stack.push(element);
                            } else {
                                closeElement(element);
                            }
                        },

                        end: function end() {
                            // remove trailing whitespace
                            var element = stack[stack.length - 1];
                            var lastNode = element.children[element.children.length - 1];
                            if (lastNode && lastNode.type === 3 && lastNode.text === ' ' && !inPre) {
                                element.children.pop();
                            }
                            // pop stack
                            stack.length -= 1;
                            currentParent = stack[stack.length - 1];
                            closeElement(element);
                        },

                        chars: function chars(text) {
                            if (!currentParent) {
                                {
                                    if (text === template) {
                                        warnOnce(
                                            'Component template requires a root element, rather than just text.'
                                        );
                                    } else if ((text = text.trim())) {
                                        warnOnce(
                                            ("text \"" + text + "\" outside root element will be ignored.")
                                        );
                                    }
                                }
                                return
                            }
                            // IE textarea placeholder bug
                            /* istanbul ignore if */
                            if (isIE &&
                                currentParent.tag === 'textarea' &&
                                currentParent.attrsMap.placeholder === text
                            ) {
                                return
                            }
                            var children = currentParent.children;
                            text = inPre || text.trim() ?
                                isTextTag(currentParent) ? text : decodeHTMLCached(text)
                                // only preserve whitespace if its not right after a starting tag
                                :
                                preserveWhitespace && children.length ? ' ' : '';
                            if (text) {
                                var res;
                                if (!inVPre && text !== ' ' && (res = parseText(text, delimiters))) {
                                    children.push({
                                        type: 2,
                                        expression: res.expression,
                                        tokens: res.tokens,
                                        text: text
                                    });
                                } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
                                    children.push({
                                        type: 3,
                                        text: text
                                    });
                                }
                            }
                        },
                        comment: function comment(text) {
                            currentParent.children.push({
                                type: 3,
                                text: text,
                                isComment: true
                            });
                        }
                    });
                    return root
                }

                function processPre(el) {
                    if (getAndRemoveAttr(el, 'v-pre') != null) {
                        el.pre = true;
                    }
                }

                function processRawAttrs(el) {
                    var l = el.attrsList.length;
                    if (l) {
                        var attrs = el.attrs = new Array(l);
                        for (var i = 0; i < l; i++) {
                            attrs[i] = {
                                name: el.attrsList[i].name,
                                value: JSON.stringify(el.attrsList[i].value)
                            };
                        }
                    } else if (!el.pre) {
                        // non root node in pre blocks with no attributes
                        el.plain = true;
                    }
                }

                function processElement(element, options) {
                    processKey(element);

                    // determine whether this is a plain element after
                    // removing structural attributes
                    element.plain = !element.key && !element.attrsList.length;

                    processRef(element);
                    processSlot(element);
                    processComponent(element);
                    for (var i = 0; i < transforms.length; i++) {
                        element = transforms[i](element, options) || element;
                    }
                    processAttrs(element);
                }

                function processKey(el) {
                    var exp = getBindingAttr(el, 'key');
                    if (exp) {
                        if ("development" !== 'production' && el.tag === 'template') {
                            warn$2("<template> cannot be keyed. Place the key on real elements instead.");
                        }
                        el.key = exp;
                    }
                }

                function processRef(el) {
                    var ref = getBindingAttr(el, 'ref');
                    if (ref) {
                        el.ref = ref;
                        el.refInFor = checkInFor(el);
                    }
                }

                function processFor(el) {
                    var exp;
                    if ((exp = getAndRemoveAttr(el, 'v-for'))) {
                        var res = parseFor(exp);
                        if (res) {
                            extend(el, res);
                        } else {
                            warn$2(
                                ("Invalid v-for expression: " + exp)
                            );
                        }
                    }
                }



                function parseFor(exp) {
                    var inMatch = exp.match(forAliasRE);
                    if (!inMatch) { return }
                    var res = {};
                    res.for = inMatch[2].trim();
                    var alias = inMatch[1].trim().replace(stripParensRE, '');
                    var iteratorMatch = alias.match(forIteratorRE);
                    if (iteratorMatch) {
                        res.alias = alias.replace(forIteratorRE, '');
                        res.iterator1 = iteratorMatch[1].trim();
                        if (iteratorMatch[2]) {
                            res.iterator2 = iteratorMatch[2].trim();
                        }
                    } else {
                        res.alias = alias;
                    }
                    return res
                }

                function processIf(el) {
                    var exp = getAndRemoveAttr(el, 'v-if');
                    if (exp) {
                        el.if = exp;
                        addIfCondition(el, {
                            exp: exp,
                            block: el
                        });
                    } else {
                        if (getAndRemoveAttr(el, 'v-else') != null) {
                            el.else = true;
                        }
                        var elseif = getAndRemoveAttr(el, 'v-else-if');
                        if (elseif) {
                            el.elseif = elseif;
                        }
                    }
                }

                function processIfConditions(el, parent) {
                    var prev = findPrevElement(parent.children);
                    if (prev && prev.if) {
                        addIfCondition(prev, {
                            exp: el.elseif,
                            block: el
                        });
                    } else {
                        warn$2(
                            "v-" + (el.elseif ? ('else-if="' + el.elseif + '"') : 'else') + " " +
                            "used on element <" + (el.tag) + "> without corresponding v-if."
                        );
                    }
                }

                function findPrevElement(children) {
                    var i = children.length;
                    while (i--) {
                        if (children[i].type === 1) {
                            return children[i]
                        } else {
                            if ("development" !== 'production' && children[i].text !== ' ') {
                                warn$2(
                                    "text \"" + (children[i].text.trim()) + "\" between v-if and v-else(-if) " +
                                    "will be ignored."
                                );
                            }
                            children.pop();
                        }
                    }
                }

                function addIfCondition(el, condition) {
                    if (!el.ifConditions) {
                        el.ifConditions = [];
                    }
                    el.ifConditions.push(condition);
                }

                function processOnce(el) {
                    var once$$1 = getAndRemoveAttr(el, 'v-once');
                    if (once$$1 != null) {
                        el.once = true;
                    }
                }

                function processSlot(el) {
                    if (el.tag === 'slot') {
                        el.slotName = getBindingAttr(el, 'name');
                        if ("development" !== 'production' && el.key) {
                            warn$2(
                                "`key` does not work on <slot> because slots are abstract outlets " +
                                "and can possibly expand into multiple elements. " +
                                "Use the key on a wrapping element instead."
                            );
                        }
                    } else {
                        var slotScope;
                        if (el.tag === 'template') {
                            slotScope = getAndRemoveAttr(el, 'scope');
                            /* istanbul ignore if */
                            if ("development" !== 'production' && slotScope) {
                                warn$2(
                                    "the \"scope\" attribute for scoped slots have been deprecated and " +
                                    "replaced by \"slot-scope\" since 2.5. The new \"slot-scope\" attribute " +
                                    "can also be used on plain elements in addition to <template> to " +
                                    "denote scoped slots.",
                                    true
                                );
                            }
                            el.slotScope = slotScope || getAndRemoveAttr(el, 'slot-scope');
                        } else if ((slotScope = getAndRemoveAttr(el, 'slot-scope'))) {
                            /* istanbul ignore if */
                            if ("development" !== 'production' && el.attrsMap['v-for']) {
                                warn$2(
                                    "Ambiguous combined usage of slot-scope and v-for on <" + (el.tag) + "> " +
                                    "(v-for takes higher priority). Use a wrapper <template> for the " +
                                    "scoped slot to make it clearer.",
                                    true
                                );
                            }
                            el.slotScope = slotScope;
                        }
                        var slotTarget = getBindingAttr(el, 'slot');
                        if (slotTarget) {
                            el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
                            // preserve slot as an attribute for native shadow DOM compat
                            // only for non-scoped slots.
                            if (el.tag !== 'template' && !el.slotScope) {
                                addAttr(el, 'slot', slotTarget);
                            }
                        }
                    }
                }

                function processComponent(el) {
                    var binding;
                    if ((binding = getBindingAttr(el, 'is'))) {
                        el.component = binding;
                    }
                    if (getAndRemoveAttr(el, 'inline-template') != null) {
                        el.inlineTemplate = true;
                    }
                }

                function processAttrs(el) {
                    var list = el.attrsList;
                    var i, l, name, rawName, value, modifiers, isProp;
                    for (i = 0, l = list.length; i < l; i++) {
                        name = rawName = list[i].name;
                        value = list[i].value;
                        if (dirRE.test(name)) {
                            // mark element as dynamic
                            el.hasBindings = true;
                            // modifiers
                            modifiers = parseModifiers(name);
                            if (modifiers) {
                                name = name.replace(modifierRE, '');
                            }
                            if (bindRE.test(name)) { // v-bind
                                name = name.replace(bindRE, '');
                                value = parseFilters(value);
                                isProp = false;
                                if (modifiers) {
                                    if (modifiers.prop) {
                                        isProp = true;
                                        name = camelize(name);
                                        if (name === 'innerHtml') { name = 'innerHTML'; }
                                    }
                                    if (modifiers.camel) {
                                        name = camelize(name);
                                    }
                                    if (modifiers.sync) {
                                        addHandler(
                                            el,
                                            ("update:" + (camelize(name))),
                                            genAssignmentCode(value, "$event")
                                        );
                                    }
                                }
                                if (isProp || (!el.component && platformMustUseProp(el.tag, el.attrsMap.type, name))) {
                                    addProp(el, name, value);
                                } else {
                                    addAttr(el, name, value);
                                }
                            } else if (onRE.test(name)) { // v-on
                                name = name.replace(onRE, '');
                                addHandler(el, name, value, modifiers, false, warn$2);
                            } else { // normal directives
                                name = name.replace(dirRE, '');
                                // parse arg
                                var argMatch = name.match(argRE);
                                var arg = argMatch && argMatch[1];
                                if (arg) {
                                    name = name.slice(0, -(arg.length + 1));
                                }
                                addDirective(el, name, rawName, value, arg, modifiers);
                                if ("development" !== 'production' && name === 'model') {
                                    checkForAliasModel(el, value);
                                }
                            }
                        } else {
                            // literal attribute
                            {
                                var res = parseText(value, delimiters);
                                if (res) {
                                    warn$2(
                                        name + "=\"" + value + "\": " +
                                        'Interpolation inside attributes has been removed. ' +
                                        'Use v-bind or the colon shorthand instead. For example, ' +
                                        'instead of <div id="{{ val }}">, use <div :id="val">.'
                                    );
                                }
                            }
                            addAttr(el, name, JSON.stringify(value));
                            // #6887 firefox doesn't update muted state if set via attribute
                            // even immediately after element creation
                            if (!el.component &&
                                name === 'muted' &&
                                platformMustUseProp(el.tag, el.attrsMap.type, name)) {
                                addProp(el, name, 'true');
                            }
                        }
                    }
                }

                function checkInFor(el) {
                    var parent = el;
                    while (parent) {
                        if (parent.for !== undefined) {
                            return true
                        }
                        parent = parent.parent;
                    }
                    return false
                }

                function parseModifiers(name) {
                    var match = name.match(modifierRE);
                    if (match) {
                        var ret = {};
                        match.forEach(function(m) { ret[m.slice(1)] = true; });
                        return ret
                    }
                }

                function makeAttrsMap(attrs) {
                    var map = {};
                    for (var i = 0, l = attrs.length; i < l; i++) {
                        if (
                            "development" !== 'production' &&
                            map[attrs[i].name] && !isIE && !isEdge
                        ) {
                            warn$2('duplicate attribute: ' + attrs[i].name);
                        }
                        map[attrs[i].name] = attrs[i].value;
                    }
                    return map
                }

                // for script (e.g. type="x/template") or style, do not decode content
                function isTextTag(el) {
                    return el.tag === 'script' || el.tag === 'style'
                }

                function isForbiddenTag(el) {
                    return (
                        el.tag === 'style' ||
                        (el.tag === 'script' && (!el.attrsMap.type ||
                            el.attrsMap.type === 'text/javascript'
                        ))
                    )
                }

                var ieNSBug = /^xmlns:NS\d+/;
                var ieNSPrefix = /^NS\d+:/;

                /* istanbul ignore next */
                function guardIESVGBug(attrs) {
                    var res = [];
                    for (var i = 0; i < attrs.length; i++) {
                        var attr = attrs[i];
                        if (!ieNSBug.test(attr.name)) {
                            attr.name = attr.name.replace(ieNSPrefix, '');
                            res.push(attr);
                        }
                    }
                    return res
                }

                function checkForAliasModel(el, value) {
                    var _el = el;
                    while (_el) {
                        if (_el.for && _el.alias === value) {
                            warn$2(
                                "<" + (el.tag) + " v-model=\"" + value + "\">: " +
                                "You are binding v-model directly to a v-for iteration alias. " +
                                "This will not be able to modify the v-for source array because " +
                                "writing to the alias is like modifying a function local variable. " +
                                "Consider using an array of objects and use v-model on an object property instead."
                            );
                        }
                        _el = _el.parent;
                    }
                }

                /*  */

                /**
                 * Expand input[v-model] with dyanmic type bindings into v-if-else chains
                 * Turn this:
                 *   <input v-model="data[type]" :type="type">
                 * into this:
                 *   <input v-if="type === 'checkbox'" type="checkbox" v-model="data[type]">
                 *   <input v-else-if="type === 'radio'" type="radio" v-model="data[type]">
                 *   <input v-else :type="type" v-model="data[type]">
                 */

                function preTransformNode(el, options) {
                    if (el.tag === 'input') {
                        var map = el.attrsMap;
                        if (!map['v-model']) {
                            return
                        }

                        var typeBinding;
                        if (map[':type'] || map['v-bind:type']) {
                            typeBinding = getBindingAttr(el, 'type');
                        }
                        if (!map.type && !typeBinding && map['v-bind']) {
                            typeBinding = "(" + (map['v-bind']) + ").type";
                        }

                        if (typeBinding) {
                            var ifCondition = getAndRemoveAttr(el, 'v-if', true);
                            var ifConditionExtra = ifCondition ? ("&&(" + ifCondition + ")") : "";
                            var hasElse = getAndRemoveAttr(el, 'v-else', true) != null;
                            var elseIfCondition = getAndRemoveAttr(el, 'v-else-if', true);
                            // 1. checkbox
                            var branch0 = cloneASTElement(el);
                            // process for on the main node
                            processFor(branch0);
                            addRawAttr(branch0, 'type', 'checkbox');
                            processElement(branch0, options);
                            branch0.processed = true; // prevent it from double-processed
                            branch0.if = "(" + typeBinding + ")==='checkbox'" + ifConditionExtra;
                            addIfCondition(branch0, {
                                exp: branch0.if,
                                block: branch0
                            });
                            // 2. add radio else-if condition
                            var branch1 = cloneASTElement(el);
                            getAndRemoveAttr(branch1, 'v-for', true);
                            addRawAttr(branch1, 'type', 'radio');
                            processElement(branch1, options);
                            addIfCondition(branch0, {
                                exp: "(" + typeBinding + ")==='radio'" + ifConditionExtra,
                                block: branch1
                            });
                            // 3. other
                            var branch2 = cloneASTElement(el);
                            getAndRemoveAttr(branch2, 'v-for', true);
                            addRawAttr(branch2, ':type', typeBinding);
                            processElement(branch2, options);
                            addIfCondition(branch0, {
                                exp: ifCondition,
                                block: branch2
                            });

                            if (hasElse) {
                                branch0.else = true;
                            } else if (elseIfCondition) {
                                branch0.elseif = elseIfCondition;
                            }

                            return branch0
                        }
                    }
                }

                function cloneASTElement(el) {
                    return createASTElement(el.tag, el.attrsList.slice(), el.parent)
                }

                var model$2 = {
                    preTransformNode: preTransformNode
                }

                var modules$1 = [
                    klass$1,
                    style$1,
                    model$2
                ]

                /*  */

                function text(el, dir) {
                    if (dir.value) {
                        addProp(el, 'textContent', ("_s(" + (dir.value) + ")"));
                    }
                }

                /*  */

                function html(el, dir) {
                    if (dir.value) {
                        addProp(el, 'innerHTML', ("_s(" + (dir.value) + ")"));
                    }
                }

                var directives$1 = {
                    model: model,
                    text: text,
                    html: html
                }

                /*  */

                var baseOptions = {
                    expectHTML: true,
                    modules: modules$1,
                    directives: directives$1,
                    isPreTag: isPreTag,
                    isUnaryTag: isUnaryTag,
                    mustUseProp: mustUseProp,
                    canBeLeftOpenTag: canBeLeftOpenTag,
                    isReservedTag: isReservedTag,
                    getTagNamespace: getTagNamespace,
                    staticKeys: genStaticKeys(modules$1)
                };

                /*  */

                var isStaticKey;
                var isPlatformReservedTag;

                var genStaticKeysCached = cached(genStaticKeys$1);

                /**
                 * Goal of the optimizer: walk the generated template AST tree
                 * and detect sub-trees that are purely static, i.e. parts of
                 * the DOM that never needs to change.
                 *
                 * Once we detect these sub-trees, we can:
                 *
                 * 1. Hoist them into constants, so that we no longer need to
                 *    create fresh nodes for them on each re-render;
                 * 2. Completely skip them in the patching process.
                 */
                function optimize(root, options) {
                    if (!root) { return }
                    isStaticKey = genStaticKeysCached(options.staticKeys || '');
                    isPlatformReservedTag = options.isReservedTag || no;
                    // first pass: mark all non-static nodes.
                    markStatic$1(root);
                    // second pass: mark static roots.
                    markStaticRoots(root, false);
                }

                function genStaticKeys$1(keys) {
                    return makeMap(
                        'type,tag,attrsList,attrsMap,plain,parent,children,attrs' +
                        (keys ? ',' + keys : '')
                    )
                }

                function markStatic$1(node) {
                    node.static = isStatic(node);
                    if (node.type === 1) {
                        // do not make component slot content static. this avoids
                        // 1. components not able to mutate slot nodes
                        // 2. static slot content fails for hot-reloading
                        if (!isPlatformReservedTag(node.tag) &&
                            node.tag !== 'slot' &&
                            node.attrsMap['inline-template'] == null
                        ) {
                            return
                        }
                        for (var i = 0, l = node.children.length; i < l; i++) {
                            var child = node.children[i];
                            markStatic$1(child);
                            if (!child.static) {
                                node.static = false;
                            }
                        }
                        if (node.ifConditions) {
                            for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
                                var block = node.ifConditions[i$1].block;
                                markStatic$1(block);
                                if (!block.static) {
                                    node.static = false;
                                }
                            }
                        }
                    }
                }

                function markStaticRoots(node, isInFor) {
                    if (node.type === 1) {
                        if (node.static || node.once) {
                            node.staticInFor = isInFor;
                        }
                        // For a node to qualify as a static root, it should have children that
                        // are not just static text. Otherwise the cost of hoisting out will
                        // outweigh the benefits and it's better off to just always render it fresh.
                        if (node.static && node.children.length && !(
                                node.children.length === 1 &&
                                node.children[0].type === 3
                            )) {
                            node.staticRoot = true;
                            return
                        } else {
                            node.staticRoot = false;
                        }
                        if (node.children) {
                            for (var i = 0, l = node.children.length; i < l; i++) {
                                markStaticRoots(node.children[i], isInFor || !!node.for);
                            }
                        }
                        if (node.ifConditions) {
                            for (var i$1 = 1, l$1 = node.ifConditions.length; i$1 < l$1; i$1++) {
                                markStaticRoots(node.ifConditions[i$1].block, isInFor);
                            }
                        }
                    }
                }

                function isStatic(node) {
                    if (node.type === 2) { // expression
                        return false
                    }
                    if (node.type === 3) { // text
                        return true
                    }
                    return !!(node.pre || (!node.hasBindings && // no dynamic bindings
                        !node.if && !node.for && // not v-if or v-for or v-else
                        !isBuiltInTag(node.tag) && // not a built-in
                        isPlatformReservedTag(node.tag) && // not a component
                        !isDirectChildOfTemplateFor(node) &&
                        Object.keys(node).every(isStaticKey)
                    ))
                }

                function isDirectChildOfTemplateFor(node) {
                    while (node.parent) {
                        node = node.parent;
                        if (node.tag !== 'template') {
                            return false
                        }
                        if (node.for) {
                            return true
                        }
                    }
                    return false
                }

                /*  */

                var fnExpRE = /^([\w$_]+|\([^)]*?\))\s*=>|^function\s*\(/;
                var simplePathRE = /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['[^']*?']|\["[^"]*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*$/;

                // KeyboardEvent.keyCode aliases
                var keyCodes = {
                    esc: 27,
                    tab: 9,
                    enter: 13,
                    space: 32,
                    up: 38,
                    left: 37,
                    right: 39,
                    down: 40,
                    'delete': [8, 46]
                };

                // KeyboardEvent.key aliases
                var keyNames = {
                    esc: 'Escape',
                    tab: 'Tab',
                    enter: 'Enter',
                    space: ' ',
                    // #7806: IE11 uses key names without `Arrow` prefix for arrow keys.
                    up: ['Up', 'ArrowUp'],
                    left: ['Left', 'ArrowLeft'],
                    right: ['Right', 'ArrowRight'],
                    down: ['Down', 'ArrowDown'],
                    'delete': ['Backspace', 'Delete']
                };

                // #4868: modifiers that prevent the execution of the listener
                // need to explicitly return null so that we can determine whether to remove
                // the listener for .once
                var genGuard = function(condition) { return ("if(" + condition + ")return null;"); };

                var modifierCode = {
                    stop: '$event.stopPropagation();',
                    prevent: '$event.preventDefault();',
                    self: genGuard("$event.target !== $event.currentTarget"),
                    ctrl: genGuard("!$event.ctrlKey"),
                    shift: genGuard("!$event.shiftKey"),
                    alt: genGuard("!$event.altKey"),
                    meta: genGuard("!$event.metaKey"),
                    left: genGuard("'button' in $event && $event.button !== 0"),
                    middle: genGuard("'button' in $event && $event.button !== 1"),
                    right: genGuard("'button' in $event && $event.button !== 2")
                };

                function genHandlers(
                    events,
                    isNative,
                    warn
                ) {
                    var res = isNative ? 'nativeOn:{' : 'on:{';
                    for (var name in events) {
                        res += "\"" + name + "\":" + (genHandler(name, events[name])) + ",";
                    }
                    return res.slice(0, -1) + '}'
                }

                function genHandler(
                    name,
                    handler
                ) {
                    if (!handler) {
                        return 'function(){}'
                    }

                    if (Array.isArray(handler)) {
                        return ("[" + (handler.map(function(handler) { return genHandler(name, handler); }).join(',')) + "]")
                    }

                    var isMethodPath = simplePathRE.test(handler.value);
                    var isFunctionExpression = fnExpRE.test(handler.value);

                    if (!handler.modifiers) {
                        if (isMethodPath || isFunctionExpression) {
                            return handler.value
                        }
                        /* istanbul ignore if */
                        return ("function($event){" + (handler.value) + "}") // inline statement
                    } else {
                        var code = '';
                        var genModifierCode = '';
                        var keys = [];
                        for (var key in handler.modifiers) {
                            if (modifierCode[key]) {
                                genModifierCode += modifierCode[key];
                                // left/right
                                if (keyCodes[key]) {
                                    keys.push(key);
                                }
                            } else if (key === 'exact') {
                                var modifiers = (handler.modifiers);
                                genModifierCode += genGuard(
                                    ['ctrl', 'shift', 'alt', 'meta']
                                    .filter(function(keyModifier) { return !modifiers[keyModifier]; })
                                    .map(function(keyModifier) { return ("$event." + keyModifier + "Key"); })
                                    .join('||')
                                );
                            } else {
                                keys.push(key);
                            }
                        }
                        if (keys.length) {
                            code += genKeyFilter(keys);
                        }
                        // Make sure modifiers like prevent and stop get executed after key filtering
                        if (genModifierCode) {
                            code += genModifierCode;
                        }
                        var handlerCode = isMethodPath ?
                            ("return " + (handler.value) + "($event)") :
                            isFunctionExpression ?
                            ("return (" + (handler.value) + ")($event)") :
                            handler.value;
                        /* istanbul ignore if */
                        return ("function($event){" + code + handlerCode + "}")
                    }
                }

                function genKeyFilter(keys) {
                    return ("if(!('button' in $event)&&" + (keys.map(genFilterCode).join('&&')) + ")return null;")
                }

                function genFilterCode(key) {
                    var keyVal = parseInt(key, 10);
                    if (keyVal) {
                        return ("$event.keyCode!==" + keyVal)
                    }
                    var keyCode = keyCodes[key];
                    var keyName = keyNames[key];
                    return (
                        "_k($event.keyCode," +
                        (JSON.stringify(key)) + "," +
                        (JSON.stringify(keyCode)) + "," +
                        "$event.key," +
                        "" + (JSON.stringify(keyName)) +
                        ")"
                    )
                }

                /*  */

                function on(el, dir) {
                    if ("development" !== 'production' && dir.modifiers) {
                        warn("v-on without argument does not support modifiers.");
                    }
                    el.wrapListeners = function(code) { return ("_g(" + code + "," + (dir.value) + ")"); };
                }

                /*  */

                function bind$1(el, dir) {
                    el.wrapData = function(code) {
                        return ("_b(" + code + ",'" + (el.tag) + "'," + (dir.value) + "," + (dir.modifiers && dir.modifiers.prop ? 'true' : 'false') + (dir.modifiers && dir.modifiers.sync ? ',true' : '') + ")")
                    };
                }

                /*  */

                var baseDirectives = {
                    on: on,
                    bind: bind$1,
                    cloak: noop
                }

                /*  */

                var CodegenState = function CodegenState(options) {
                    this.options = options;
                    this.warn = options.warn || baseWarn;
                    this.transforms = pluckModuleFunction(options.modules, 'transformCode');
                    this.dataGenFns = pluckModuleFunction(options.modules, 'genData');
                    this.directives = extend(extend({}, baseDirectives), options.directives);
                    var isReservedTag = options.isReservedTag || no;
                    this.maybeComponent = function(el) { return !isReservedTag(el.tag); };
                    this.onceId = 0;
                    this.staticRenderFns = [];
                };



                function generate(
                    ast,
                    options
                ) {
                    var state = new CodegenState(options);
                    var code = ast ? genElement(ast, state) : '_c("div")';
                    return {
                        render: ("with(this){return " + code + "}"),
                        staticRenderFns: state.staticRenderFns
                    }
                }

                function genElement(el, state) {
                    if (el.staticRoot && !el.staticProcessed) {
                        return genStatic(el, state)
                    } else if (el.once && !el.onceProcessed) {
                        return genOnce(el, state)
                    } else if (el.for && !el.forProcessed) {
                        return genFor(el, state)
                    } else if (el.if && !el.ifProcessed) {
                        return genIf(el, state)
                    } else if (el.tag === 'template' && !el.slotTarget) {
                        return genChildren(el, state) || 'void 0'
                    } else if (el.tag === 'slot') {
                        return genSlot(el, state)
                    } else {
                        // component or element
                        var code;
                        if (el.component) {
                            code = genComponent(el.component, el, state);
                        } else {
                            var data = el.plain ? undefined : genData$2(el, state);

                            var children = el.inlineTemplate ? null : genChildren(el, state, true);
                            code = "_c('" + (el.tag) + "'" + (data ? ("," + data) : '') + (children ? ("," + children) : '') + ")";
                        }
                        // module transforms
                        for (var i = 0; i < state.transforms.length; i++) {
                            code = state.transforms[i](el, code);
                        }
                        return code
                    }
                }

                // hoist static sub-trees out
                function genStatic(el, state) {
                    el.staticProcessed = true;
                    state.staticRenderFns.push(("with(this){return " + (genElement(el, state)) + "}"));
                    return ("_m(" + (state.staticRenderFns.length - 1) + (el.staticInFor ? ',true' : '') + ")")
                }

                // v-once
                function genOnce(el, state) {
                    el.onceProcessed = true;
                    if (el.if && !el.ifProcessed) {
                        return genIf(el, state)
                    } else if (el.staticInFor) {
                        var key = '';
                        var parent = el.parent;
                        while (parent) {
                            if (parent.for) {
                                key = parent.key;
                                break
                            }
                            parent = parent.parent;
                        }
                        if (!key) {
                            "development" !== 'production' && state.warn(
                                "v-once can only be used inside v-for that is keyed. "
                            );
                            return genElement(el, state)
                        }
                        return ("_o(" + (genElement(el, state)) + "," + (state.onceId++) + "," + key + ")")
                    } else {
                        return genStatic(el, state)
                    }
                }

                function genIf(
                    el,
                    state,
                    altGen,
                    altEmpty
                ) {
                    el.ifProcessed = true; // avoid recursion
                    return genIfConditions(el.ifConditions.slice(), state, altGen, altEmpty)
                }

                function genIfConditions(
                    conditions,
                    state,
                    altGen,
                    altEmpty
                ) {
                    if (!conditions.length) {
                        return altEmpty || '_e()'
                    }

                    var condition = conditions.shift();
                    if (condition.exp) {
                        return ("(" + (condition.exp) + ")?" + (genTernaryExp(condition.block)) + ":" + (genIfConditions(conditions, state, altGen, altEmpty)))
                    } else {
                        return ("" + (genTernaryExp(condition.block)))
                    }

                    // v-if with v-once should generate code like (a)?_m(0):_m(1)
                    function genTernaryExp(el) {
                        return altGen ?
                            altGen(el, state) :
                            el.once ?
                            genOnce(el, state) :
                            genElement(el, state)
                    }
                }

                function genFor(
                    el,
                    state,
                    altGen,
                    altHelper
                ) {
                    var exp = el.for;
                    var alias = el.alias;
                    var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
                    var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';

                    if ("development" !== 'production' &&
                        state.maybeComponent(el) &&
                        el.tag !== 'slot' &&
                        el.tag !== 'template' &&
                        !el.key
                    ) {
                        state.warn(
                            "<" + (el.tag) + " v-for=\"" + alias + " in " + exp + "\">: component lists rendered with " +
                            "v-for should have explicit keys. " +
                            "See https://vuejs.org/guide/list.html#key for more info.",
                            true /* tip */
                        );
                    }

                    el.forProcessed = true; // avoid recursion
                    return (altHelper || '_l') + "((" + exp + ")," +
                        "function(" + alias + iterator1 + iterator2 + "){" +
                        "return " + ((altGen || genElement)(el, state)) +
                        '})'
                }

                function genData$2(el, state) {
                    var data = '{';

                    // directives first.
                    // directives may mutate the el's other properties before they are generated.
                    var dirs = genDirectives(el, state);
                    if (dirs) { data += dirs + ','; }

                    // key
                    if (el.key) {
                        data += "key:" + (el.key) + ",";
                    }
                    // ref
                    if (el.ref) {
                        data += "ref:" + (el.ref) + ",";
                    }
                    if (el.refInFor) {
                        data += "refInFor:true,";
                    }
                    // pre
                    if (el.pre) {
                        data += "pre:true,";
                    }
                    // record original tag name for components using "is" attribute
                    if (el.component) {
                        data += "tag:\"" + (el.tag) + "\",";
                    }
                    // module data generation functions
                    for (var i = 0; i < state.dataGenFns.length; i++) {
                        data += state.dataGenFns[i](el);
                    }
                    // attributes
                    if (el.attrs) {
                        data += "attrs:{" + (genProps(el.attrs)) + "},";
                    }
                    // DOM props
                    if (el.props) {
                        data += "domProps:{" + (genProps(el.props)) + "},";
                    }
                    // event handlers
                    if (el.events) {
                        data += (genHandlers(el.events, false, state.warn)) + ",";
                    }
                    if (el.nativeEvents) {
                        data += (genHandlers(el.nativeEvents, true, state.warn)) + ",";
                    }
                    // slot target
                    // only for non-scoped slots
                    if (el.slotTarget && !el.slotScope) {
                        data += "slot:" + (el.slotTarget) + ",";
                    }
                    // scoped slots
                    if (el.scopedSlots) {
                        data += (genScopedSlots(el.scopedSlots, state)) + ",";
                    }
                    // component v-model
                    if (el.model) {
                        data += "model:{value:" + (el.model.value) + ",callback:" + (el.model.callback) + ",expression:" + (el.model.expression) + "},";
                    }
                    // inline-template
                    if (el.inlineTemplate) {
                        var inlineTemplate = genInlineTemplate(el, state);
                        if (inlineTemplate) {
                            data += inlineTemplate + ",";
                        }
                    }
                    data = data.replace(/,$/, '') + '}';
                    // v-bind data wrap
                    if (el.wrapData) {
                        data = el.wrapData(data);
                    }
                    // v-on data wrap
                    if (el.wrapListeners) {
                        data = el.wrapListeners(data);
                    }
                    return data
                }

                function genDirectives(el, state) {
                    var dirs = el.directives;
                    if (!dirs) { return }
                    var res = 'directives:[';
                    var hasRuntime = false;
                    var i, l, dir, needRuntime;
                    for (i = 0, l = dirs.length; i < l; i++) {
                        dir = dirs[i];
                        needRuntime = true;
                        var gen = state.directives[dir.name];
                        if (gen) {
                            // compile-time directive that manipulates AST.
                            // returns true if it also needs a runtime counterpart.
                            needRuntime = !!gen(el, dir, state.warn);
                        }
                        if (needRuntime) {
                            hasRuntime = true;
                            res += "{name:\"" + (dir.name) + "\",rawName:\"" + (dir.rawName) + "\"" + (dir.value ? (",value:(" + (dir.value) + "),expression:" + (JSON.stringify(dir.value))) : '') + (dir.arg ? (",arg:\"" + (dir.arg) + "\"") : '') + (dir.modifiers ? (",modifiers:" + (JSON.stringify(dir.modifiers))) : '') + "},";
                        }
                    }
                    if (hasRuntime) {
                        return res.slice(0, -1) + ']'
                    }
                }

                function genInlineTemplate(el, state) {
                    var ast = el.children[0];
                    if ("development" !== 'production' && (
                            el.children.length !== 1 || ast.type !== 1
                        )) {
                        state.warn('Inline-template components must have exactly one child element.');
                    }
                    if (ast.type === 1) {
                        var inlineRenderFns = generate(ast, state.options);
                        return ("inlineTemplate:{render:function(){" + (inlineRenderFns.render) + "},staticRenderFns:[" + (inlineRenderFns.staticRenderFns.map(function(code) { return ("function(){" + code + "}"); }).join(',')) + "]}")
                    }
                }

                function genScopedSlots(
                    slots,
                    state
                ) {
                    return ("scopedSlots:_u([" + (Object.keys(slots).map(function(key) {
                        return genScopedSlot(key, slots[key], state)
                    }).join(',')) + "])")
                }

                function genScopedSlot(
                    key,
                    el,
                    state
                ) {
                    if (el.for && !el.forProcessed) {
                        return genForScopedSlot(key, el, state)
                    }
                    var fn = "function(" + (String(el.slotScope)) + "){" +
                        "return " + (el.tag === 'template' ?
                            el.if ?
                            ((el.if) + "?" + (genChildren(el, state) || 'undefined') + ":undefined") :
                            genChildren(el, state) || 'undefined' :
                            genElement(el, state)) + "}";
                    return ("{key:" + key + ",fn:" + fn + "}")
                }

                function genForScopedSlot(
                    key,
                    el,
                    state
                ) {
                    var exp = el.for;
                    var alias = el.alias;
                    var iterator1 = el.iterator1 ? ("," + (el.iterator1)) : '';
                    var iterator2 = el.iterator2 ? ("," + (el.iterator2)) : '';
                    el.forProcessed = true; // avoid recursion
                    return "_l((" + exp + ")," +
                        "function(" + alias + iterator1 + iterator2 + "){" +
                        "return " + (genScopedSlot(key, el, state)) +
                        '})'
                }

                function genChildren(
                    el,
                    state,
                    checkSkip,
                    altGenElement,
                    altGenNode
                ) {
                    var children = el.children;
                    if (children.length) {
                        var el$1 = children[0];
                        // optimize single v-for
                        if (children.length === 1 &&
                            el$1.for &&
                            el$1.tag !== 'template' &&
                            el$1.tag !== 'slot'
                        ) {
                            return (altGenElement || genElement)(el$1, state)
                        }
                        var normalizationType = checkSkip ?
                            getNormalizationType(children, state.maybeComponent) :
                            0;
                        var gen = altGenNode || genNode;
                        return ("[" + (children.map(function(c) { return gen(c, state); }).join(',')) + "]" + (normalizationType ? ("," + normalizationType) : ''))
                    }
                }

                // determine the normalization needed for the children array.
                // 0: no normalization needed
                // 1: simple normalization needed (possible 1-level deep nested array)
                // 2: full normalization needed
                function getNormalizationType(
                    children,
                    maybeComponent
                ) {
                    var res = 0;
                    for (var i = 0; i < children.length; i++) {
                        var el = children[i];
                        if (el.type !== 1) {
                            continue
                        }
                        if (needsNormalization(el) ||
                            (el.ifConditions && el.ifConditions.some(function(c) { return needsNormalization(c.block); }))) {
                            res = 2;
                            break
                        }
                        if (maybeComponent(el) ||
                            (el.ifConditions && el.ifConditions.some(function(c) { return maybeComponent(c.block); }))) {
                            res = 1;
                        }
                    }
                    return res
                }

                function needsNormalization(el) {
                    return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'
                }

                function genNode(node, state) {
                    if (node.type === 1) {
                        return genElement(node, state)
                    }
                    if (node.type === 3 && node.isComment) {
                        return genComment(node)
                    } else {
                        return genText(node)
                    }
                }

                function genText(text) {
                    return ("_v(" + (text.type === 2 ?
                        text.expression // no need for () because already wrapped in _s()
                        :
                        transformSpecialNewlines(JSON.stringify(text.text))) + ")")
                }

                function genComment(comment) {
                    return ("_e(" + (JSON.stringify(comment.text)) + ")")
                }

                function genSlot(el, state) {
                    var slotName = el.slotName || '"default"';
                    var children = genChildren(el, state);
                    var res = "_t(" + slotName + (children ? ("," + children) : '');
                    var attrs = el.attrs && ("{" + (el.attrs.map(function(a) { return ((camelize(a.name)) + ":" + (a.value)); }).join(',')) + "}");
                    var bind$$1 = el.attrsMap['v-bind'];
                    if ((attrs || bind$$1) && !children) {
                        res += ",null";
                    }
                    if (attrs) {
                        res += "," + attrs;
                    }
                    if (bind$$1) {
                        res += (attrs ? '' : ',null') + "," + bind$$1;
                    }
                    return res + ')'
                }

                // componentName is el.component, take it as argument to shun flow's pessimistic refinement
                function genComponent(
                    componentName,
                    el,
                    state
                ) {
                    var children = el.inlineTemplate ? null : genChildren(el, state, true);
                    return ("_c(" + componentName + "," + (genData$2(el, state)) + (children ? ("," + children) : '') + ")")
                }

                function genProps(props) {
                    var res = '';
                    for (var i = 0; i < props.length; i++) {
                        var prop = props[i];
                        /* istanbul ignore if */
                        {
                            res += "\"" + (prop.name) + "\":" + (transformSpecialNewlines(prop.value)) + ",";
                        }
                    }
                    return res.slice(0, -1)
                }

                // #3895, #4268
                function transformSpecialNewlines(text) {
                    return text
                        .replace(/\u2028/g, '\\u2028')
                        .replace(/\u2029/g, '\\u2029')
                }

                /*  */

                // these keywords should not appear inside expressions, but operators like
                // typeof, instanceof and in are allowed
                var prohibitedKeywordRE = new RegExp('\\b' + (
                    'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
                    'super,throw,while,yield,delete,export,import,return,switch,default,' +
                    'extends,finally,continue,debugger,function,arguments'
                ).split(',').join('\\b|\\b') + '\\b');

                // these unary operators should not be used as property/method names
                var unaryOperatorsRE = new RegExp('\\b' + (
                    'delete,typeof,void'
                ).split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)');

                // strip strings in expressions
                var stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;

                // detect problematic expressions in a template
                function detectErrors(ast) {
                    var errors = [];
                    if (ast) {
                        checkNode(ast, errors);
                    }
                    return errors
                }

                function checkNode(node, errors) {
                    if (node.type === 1) {
                        for (var name in node.attrsMap) {
                            if (dirRE.test(name)) {
                                var value = node.attrsMap[name];
                                if (value) {
                                    if (name === 'v-for') {
                                        checkFor(node, ("v-for=\"" + value + "\""), errors);
                                    } else if (onRE.test(name)) {
                                        checkEvent(value, (name + "=\"" + value + "\""), errors);
                                    } else {
                                        checkExpression(value, (name + "=\"" + value + "\""), errors);
                                    }
                                }
                            }
                        }
                        if (node.children) {
                            for (var i = 0; i < node.children.length; i++) {
                                checkNode(node.children[i], errors);
                            }
                        }
                    } else if (node.type === 2) {
                        checkExpression(node.expression, node.text, errors);
                    }
                }

                function checkEvent(exp, text, errors) {
                    var stipped = exp.replace(stripStringRE, '');
                    var keywordMatch = stipped.match(unaryOperatorsRE);
                    if (keywordMatch && stipped.charAt(keywordMatch.index - 1) !== '$') {
                        errors.push(
                            "avoid using JavaScript unary operator as property name: " +
                            "\"" + (keywordMatch[0]) + "\" in expression " + (text.trim())
                        );
                    }
                    checkExpression(exp, text, errors);
                }

                function checkFor(node, text, errors) {
                    checkExpression(node.for || '', text, errors);
                    checkIdentifier(node.alias, 'v-for alias', text, errors);
                    checkIdentifier(node.iterator1, 'v-for iterator', text, errors);
                    checkIdentifier(node.iterator2, 'v-for iterator', text, errors);
                }

                function checkIdentifier(
                    ident,
                    type,
                    text,
                    errors
                ) {
                    if (typeof ident === 'string') {
                        try {
                            new Function(("var " + ident + "=_"));
                        } catch (e) {
                            errors.push(("invalid " + type + " \"" + ident + "\" in expression: " + (text.trim())));
                        }
                    }
                }

                function checkExpression(exp, text, errors) {
                    try {
                        new Function(("return " + exp));
                    } catch (e) {
                        var keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);
                        if (keywordMatch) {
                            errors.push(
                                "avoid using JavaScript keyword as property name: " +
                                "\"" + (keywordMatch[0]) + "\"\n  Raw expression: " + (text.trim())
                            );
                        } else {
                            errors.push(
                                "invalid expression: " + (e.message) + " in\n\n" +
                                "    " + exp + "\n\n" +
                                "  Raw expression: " + (text.trim()) + "\n"
                            );
                        }
                    }
                }

                /*  */

                function createFunction(code, errors) {
                    try {
                        return new Function(code)
                    } catch (err) {
                        errors.push({ err: err, code: code });
                        return noop
                    }
                }

                function createCompileToFunctionFn(compile) {
                    var cache = Object.create(null);

                    return function compileToFunctions(
                        template,
                        options,
                        vm
                    ) {
                        options = extend({}, options);
                        var warn$$1 = options.warn || warn;
                        delete options.warn;

                        /* istanbul ignore if */
                        {
                            // detect possible CSP restriction
                            try {
                                new Function('return 1');
                            } catch (e) {
                                if (e.toString().match(/unsafe-eval|CSP/)) {
                                    warn$$1(
                                        'It seems you are using the standalone build of Vue.js in an ' +
                                        'environment with Content Security Policy that prohibits unsafe-eval. ' +
                                        'The template compiler cannot work in this environment. Consider ' +
                                        'relaxing the policy to allow unsafe-eval or pre-compiling your ' +
                                        'templates into render functions.'
                                    );
                                }
                            }
                        }

                        // check cache
                        var key = options.delimiters ?
                            String(options.delimiters) + template :
                            template;
                        if (cache[key]) {
                            return cache[key]
                        }

                        // compile
                        var compiled = compile(template, options);

                        // check compilation errors/tips
                        {
                            if (compiled.errors && compiled.errors.length) {
                                warn$$1(
                                    "Error compiling template:\n\n" + template + "\n\n" +
                                    compiled.errors.map(function(e) { return ("- " + e); }).join('\n') + '\n',
                                    vm
                                );
                            }
                            if (compiled.tips && compiled.tips.length) {
                                compiled.tips.forEach(function(msg) { return tip(msg, vm); });
                            }
                        }

                        // turn code into functions
                        var res = {};
                        var fnGenErrors = [];
                        res.render = createFunction(compiled.render, fnGenErrors);
                        res.staticRenderFns = compiled.staticRenderFns.map(function(code) {
                            return createFunction(code, fnGenErrors)
                        });

                        // check function generation errors.
                        // this should only happen if there is a bug in the compiler itself.
                        // mostly for codegen development use
                        /* istanbul ignore if */
                        {
                            if ((!compiled.errors || !compiled.errors.length) && fnGenErrors.length) {
                                warn$$1(
                                    "Failed to generate render function:\n\n" +
                                    fnGenErrors.map(function(ref) {
                                        var err = ref.err;
                                        var code = ref.code;

                                        return ((err.toString()) + " in\n\n" + code + "\n");
                                    }).join('\n'),
                                    vm
                                );
                            }
                        }

                        return (cache[key] = res)
                    }
                }

                /*  */

                function createCompilerCreator(baseCompile) {
                    return function createCompiler(baseOptions) {
                        function compile(
                            template,
                            options
                        ) {
                            var finalOptions = Object.create(baseOptions);
                            var errors = [];
                            var tips = [];
                            finalOptions.warn = function(msg, tip) {
                                (tip ? tips : errors).push(msg);
                            };

                            if (options) {
                                // merge custom modules
                                if (options.modules) {
                                    finalOptions.modules =
                                        (baseOptions.modules || []).concat(options.modules);
                                }
                                // merge custom directives
                                if (options.directives) {
                                    finalOptions.directives = extend(
                                        Object.create(baseOptions.directives || null),
                                        options.directives
                                    );
                                }
                                // copy other options
                                for (var key in options) {
                                    if (key !== 'modules' && key !== 'directives') {
                                        finalOptions[key] = options[key];
                                    }
                                }
                            }

                            var compiled = baseCompile(template, finalOptions); {
                                errors.push.apply(errors, detectErrors(compiled.ast));
                            }
                            compiled.errors = errors;
                            compiled.tips = tips;
                            return compiled
                        }

                        return {
                            compile: compile,
                            compileToFunctions: createCompileToFunctionFn(compile)
                        }
                    }
                }

                /*  */

                // `createCompilerCreator` allows creating compilers that use alternative
                // parser/optimizer/codegen, e.g the SSR optimizing compiler.
                // Here we just export a default compiler using the default parts.
                var createCompiler = createCompilerCreator(function baseCompile(
                    template,
                    options
                ) {
                    var ast = parse(template.trim(), options);
                    if (options.optimize !== false) {
                        optimize(ast, options);
                    }
                    var code = generate(ast, options);
                    return {
                        ast: ast,
                        render: code.render,
                        staticRenderFns: code.staticRenderFns
                    }
                });

                /*  */

                var ref$1 = createCompiler(baseOptions);
                var compileToFunctions = ref$1.compileToFunctions;

                /*  */

                // check whether current browser encodes a char inside attribute values
                var div;

                function getShouldDecode(href) {
                    div = div || document.createElement('div');
                    div.innerHTML = href ? "<a href=\"\n\"/>" : "<div a=\"\n\"/>";
                    return div.innerHTML.indexOf('&#10;') > 0
                }

                // #3663: IE encodes newlines inside attribute values while other browsers don't
                var shouldDecodeNewlines = inBrowser ? getShouldDecode(false) : false;
                // #6828: chrome encodes content in a[href]
                var shouldDecodeNewlinesForHref = inBrowser ? getShouldDecode(true) : false;

                /*  */

                var idToTemplate = cached(function(id) {
                    var el = query(id);
                    return el && el.innerHTML
                });

                var mount = Vue.prototype.$mount;
                Vue.prototype.$mount = function(
                    el,
                    hydrating
                ) {
                    el = el && query(el);

                    /* istanbul ignore if */
                    if (el === document.body || el === document.documentElement) {
                        "development" !== 'production' && warn(
                            "Do not mount Vue to <html> or <body> - mount to normal elements instead."
                        );
                        return this
                    }

                    var options = this.$options;
                    // resolve template/el and convert to render function
                    if (!options.render) {
                        var template = options.template;
                        if (template) {
                            if (typeof template === 'string') {
                                if (template.charAt(0) === '#') {
                                    template = idToTemplate(template);
                                    /* istanbul ignore if */
                                    if ("development" !== 'production' && !template) {
                                        warn(
                                            ("Template element not found or is empty: " + (options.template)),
                                            this
                                        );
                                    }
                                }
                            } else if (template.nodeType) {
                                template = template.innerHTML;
                            } else {
                                {
                                    warn('invalid template option:' + template, this);
                                }
                                return this
                            }
                        } else if (el) {
                            template = getOuterHTML(el);
                        }
                        if (template) {
                            /* istanbul ignore if */
                            if ("development" !== 'production' && config.performance && mark) {
                                mark('compile');
                            }

                            var ref = compileToFunctions(template, {
                                shouldDecodeNewlines: shouldDecodeNewlines,
                                shouldDecodeNewlinesForHref: shouldDecodeNewlinesForHref,
                                delimiters: options.delimiters,
                                comments: options.comments
                            }, this);
                            var render = ref.render;
                            var staticRenderFns = ref.staticRenderFns;
                            options.render = render;
                            options.staticRenderFns = staticRenderFns;

                            /* istanbul ignore if */
                            if ("development" !== 'production' && config.performance && mark) {
                                mark('compile end');
                                measure(("vue " + (this._name) + " compile"), 'compile', 'compile end');
                            }
                        }
                    }
                    return mount.call(this, el, hydrating)
                };

                /**
                 * Get outerHTML of elements, taking care
                 * of SVG elements in IE as well.
                 */
                function getOuterHTML(el) {
                    if (el.outerHTML) {
                        return el.outerHTML
                    } else {
                        var container = document.createElement('div');
                        container.appendChild(el.cloneNode(true));
                        return container.innerHTML
                    }
                }

                Vue.compile = compileToFunctions;

                return Vue;

            })));

            /* WEBPACK VAR INJECTION */
        }.call(exports, __webpack_require__(0), __webpack_require__(3).setImmediate))

        /***/
    }),
    /* 3 */
    /***/
    (function(module, exports, __webpack_require__) {

        /* WEBPACK VAR INJECTION */
        (function(global) {
            var scope = (typeof global !== "undefined" && global) ||
                (typeof self !== "undefined" && self) ||
                window;
            var apply = Function.prototype.apply;

            // DOM APIs, for completeness

            exports.setTimeout = function() {
                return new Timeout(apply.call(setTimeout, scope, arguments), clearTimeout);
            };
            exports.setInterval = function() {
                return new Timeout(apply.call(setInterval, scope, arguments), clearInterval);
            };
            exports.clearTimeout =
                exports.clearInterval = function(timeout) {
                    if (timeout) {
                        timeout.close();
                    }
                };

            function Timeout(id, clearFn) {
                this._id = id;
                this._clearFn = clearFn;
            }
            Timeout.prototype.unref = Timeout.prototype.ref = function() {};
            Timeout.prototype.close = function() {
                this._clearFn.call(scope, this._id);
            };

            // Does not start the time, just sets up the members needed.
            exports.enroll = function(item, msecs) {
                clearTimeout(item._idleTimeoutId);
                item._idleTimeout = msecs;
            };

            exports.unenroll = function(item) {
                clearTimeout(item._idleTimeoutId);
                item._idleTimeout = -1;
            };

            exports._unrefActive = exports.active = function(item) {
                clearTimeout(item._idleTimeoutId);

                var msecs = item._idleTimeout;
                if (msecs >= 0) {
                    item._idleTimeoutId = setTimeout(function onTimeout() {
                        if (item._onTimeout)
                            item._onTimeout();
                    }, msecs);
                }
            };

            // setimmediate attaches itself to the global object
            __webpack_require__(4);
            // On some exotic environments, it's not clear which object `setimmediate` was
            // able to install onto.  Search each possibility in the same order as the
            // `setimmediate` library.
            exports.setImmediate = (typeof self !== "undefined" && self.setImmediate) ||
                (typeof global !== "undefined" && global.setImmediate) ||
                (this && this.setImmediate);
            exports.clearImmediate = (typeof self !== "undefined" && self.clearImmediate) ||
                (typeof global !== "undefined" && global.clearImmediate) ||
                (this && this.clearImmediate);

            /* WEBPACK VAR INJECTION */
        }.call(exports, __webpack_require__(0)))

        /***/
    }),
    /* 4 */
    /***/
    (function(module, exports, __webpack_require__) {

        /* WEBPACK VAR INJECTION */
        (function(global, process) {
            (function(global, undefined) {
                "use strict";

                if (global.setImmediate) {
                    return;
                }

                var nextHandle = 1; // Spec says greater than zero
                var tasksByHandle = {};
                var currentlyRunningATask = false;
                var doc = global.document;
                var registerImmediate;

                function setImmediate(callback) {
                    // Callback can either be a function or a string
                    if (typeof callback !== "function") {
                        callback = new Function("" + callback);
                    }
                    // Copy function arguments
                    var args = new Array(arguments.length - 1);
                    for (var i = 0; i < args.length; i++) {
                        args[i] = arguments[i + 1];
                    }
                    // Store and register the task
                    var task = { callback: callback, args: args };
                    tasksByHandle[nextHandle] = task;
                    registerImmediate(nextHandle);
                    return nextHandle++;
                }

                function clearImmediate(handle) {
                    delete tasksByHandle[handle];
                }

                function run(task) {
                    var callback = task.callback;
                    var args = task.args;
                    switch (args.length) {
                        case 0:
                            callback();
                            break;
                        case 1:
                            callback(args[0]);
                            break;
                        case 2:
                            callback(args[0], args[1]);
                            break;
                        case 3:
                            callback(args[0], args[1], args[2]);
                            break;
                        default:
                            callback.apply(undefined, args);
                            break;
                    }
                }

                function runIfPresent(handle) {
                    // From the spec: "Wait until any invocations of this algorithm started before this one have completed."
                    // So if we're currently running a task, we'll need to delay this invocation.
                    if (currentlyRunningATask) {
                        // Delay by doing a setTimeout. setImmediate was tried instead, but in Firefox 7 it generated a
                        // "too much recursion" error.
                        setTimeout(runIfPresent, 0, handle);
                    } else {
                        var task = tasksByHandle[handle];
                        if (task) {
                            currentlyRunningATask = true;
                            try {
                                run(task);
                            } finally {
                                clearImmediate(handle);
                                currentlyRunningATask = false;
                            }
                        }
                    }
                }

                function installNextTickImplementation() {
                    registerImmediate = function(handle) {
                        process.nextTick(function() { runIfPresent(handle); });
                    };
                }

                function canUsePostMessage() {
                    // The test against `importScripts` prevents this implementation from being installed inside a web worker,
                    // where `global.postMessage` means something completely different and can't be used for this purpose.
                    if (global.postMessage && !global.importScripts) {
                        var postMessageIsAsynchronous = true;
                        var oldOnMessage = global.onmessage;
                        global.onmessage = function() {
                            postMessageIsAsynchronous = false;
                        };
                        global.postMessage("", "*");
                        global.onmessage = oldOnMessage;
                        return postMessageIsAsynchronous;
                    }
                }

                function installPostMessageImplementation() {
                    // Installs an event handler on `global` for the `message` event: see
                    // * https://developer.mozilla.org/en/DOM/window.postMessage
                    // * http://www.whatwg.org/specs/web-apps/current-work/multipage/comms.html#crossDocumentMessages

                    var messagePrefix = "setImmediate$" + Math.random() + "$";
                    var onGlobalMessage = function(event) {
                        if (event.source === global &&
                            typeof event.data === "string" &&
                            event.data.indexOf(messagePrefix) === 0) {
                            runIfPresent(+event.data.slice(messagePrefix.length));
                        }
                    };

                    if (global.addEventListener) {
                        global.addEventListener("message", onGlobalMessage, false);
                    } else {
                        global.attachEvent("onmessage", onGlobalMessage);
                    }

                    registerImmediate = function(handle) {
                        global.postMessage(messagePrefix + handle, "*");
                    };
                }

                function installMessageChannelImplementation() {
                    var channel = new MessageChannel();
                    channel.port1.onmessage = function(event) {
                        var handle = event.data;
                        runIfPresent(handle);
                    };

                    registerImmediate = function(handle) {
                        channel.port2.postMessage(handle);
                    };
                }

                function installReadyStateChangeImplementation() {
                    var html = doc.documentElement;
                    registerImmediate = function(handle) {
                        // Create a <script> element; its readystatechange event will be fired asynchronously once it is inserted
                        // into the document. Do so, thus queuing up the task. Remember to clean up once it's been called.
                        var script = doc.createElement("script");
                        script.onreadystatechange = function() {
                            runIfPresent(handle);
                            script.onreadystatechange = null;
                            html.removeChild(script);
                            script = null;
                        };
                        html.appendChild(script);
                    };
                }

                function installSetTimeoutImplementation() {
                    registerImmediate = function(handle) {
                        setTimeout(runIfPresent, 0, handle);
                    };
                }

                // If supported, we should attach to the prototype of global, since that is where setTimeout et al. live.
                var attachTo = Object.getPrototypeOf && Object.getPrototypeOf(global);
                attachTo = attachTo && attachTo.setTimeout ? attachTo : global;

                // Don't get fooled by e.g. browserify environments.
                if ({}.toString.call(global.process) === "[object process]") {
                    // For Node.js before 0.9
                    installNextTickImplementation();

                } else if (canUsePostMessage()) {
                    // For non-IE10 modern browsers
                    installPostMessageImplementation();

                } else if (global.MessageChannel) {
                    // For web workers, where supported
                    installMessageChannelImplementation();

                } else if (doc && "onreadystatechange" in doc.createElement("script")) {
                    // For IE 6–8
                    installReadyStateChangeImplementation();

                } else {
                    // For older browsers
                    installSetTimeoutImplementation();
                }

                attachTo.setImmediate = setImmediate;
                attachTo.clearImmediate = clearImmediate;
            }(typeof self === "undefined" ? typeof global === "undefined" ? this : global : self));

            /* WEBPACK VAR INJECTION */
        }.call(exports, __webpack_require__(0), __webpack_require__(5)))

        /***/
    }),
    /* 5 */
    /***/
    (function(module, exports) {

        // shim for using process in browser
        var process = module.exports = {};

        // cached from whatever global is present so that test runners that stub it
        // don't break things.  But we need to wrap it in a try catch in case it is
        // wrapped in strict mode code which doesn't define any globals.  It's inside a
        // function because try/catches deoptimize in certain engines.

        var cachedSetTimeout;
        var cachedClearTimeout;

        function defaultSetTimout() {
            throw new Error('setTimeout has not been defined');
        }

        function defaultClearTimeout() {
            throw new Error('clearTimeout has not been defined');
        }
        (function() {
            try {
                if (typeof setTimeout === 'function') {
                    cachedSetTimeout = setTimeout;
                } else {
                    cachedSetTimeout = defaultSetTimout;
                }
            } catch (e) {
                cachedSetTimeout = defaultSetTimout;
            }
            try {
                if (typeof clearTimeout === 'function') {
                    cachedClearTimeout = clearTimeout;
                } else {
                    cachedClearTimeout = defaultClearTimeout;
                }
            } catch (e) {
                cachedClearTimeout = defaultClearTimeout;
            }
        }())

        function runTimeout(fun) {
            if (cachedSetTimeout === setTimeout) {
                //normal enviroments in sane situations
                return setTimeout(fun, 0);
            }
            // if setTimeout wasn't available but was latter defined
            if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
                cachedSetTimeout = setTimeout;
                return setTimeout(fun, 0);
            }
            try {
                // when when somebody has screwed with setTimeout but no I.E. maddness
                return cachedSetTimeout(fun, 0);
            } catch (e) {
                try {
                    // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
                    return cachedSetTimeout.call(null, fun, 0);
                } catch (e) {
                    // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
                    return cachedSetTimeout.call(this, fun, 0);
                }
            }


        }

        function runClearTimeout(marker) {
            if (cachedClearTimeout === clearTimeout) {
                //normal enviroments in sane situations
                return clearTimeout(marker);
            }
            // if clearTimeout wasn't available but was latter defined
            if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
                cachedClearTimeout = clearTimeout;
                return clearTimeout(marker);
            }
            try {
                // when when somebody has screwed with setTimeout but no I.E. maddness
                return cachedClearTimeout(marker);
            } catch (e) {
                try {
                    // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
                    return cachedClearTimeout.call(null, marker);
                } catch (e) {
                    // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
                    // Some versions of I.E. have different rules for clearTimeout vs setTimeout
                    return cachedClearTimeout.call(this, marker);
                }
            }



        }
        var queue = [];
        var draining = false;
        var currentQueue;
        var queueIndex = -1;

        function cleanUpNextTick() {
            if (!draining || !currentQueue) {
                return;
            }
            draining = false;
            if (currentQueue.length) {
                queue = currentQueue.concat(queue);
            } else {
                queueIndex = -1;
            }
            if (queue.length) {
                drainQueue();
            }
        }

        function drainQueue() {
            if (draining) {
                return;
            }
            var timeout = runTimeout(cleanUpNextTick);
            draining = true;

            var len = queue.length;
            while (len) {
                currentQueue = queue;
                queue = [];
                while (++queueIndex < len) {
                    if (currentQueue) {
                        currentQueue[queueIndex].run();
                    }
                }
                queueIndex = -1;
                len = queue.length;
            }
            currentQueue = null;
            draining = false;
            runClearTimeout(timeout);
        }

        process.nextTick = function(fun) {
            var args = new Array(arguments.length - 1);
            if (arguments.length > 1) {
                for (var i = 1; i < arguments.length; i++) {
                    args[i - 1] = arguments[i];
                }
            }
            queue.push(new Item(fun, args));
            if (queue.length === 1 && !draining) {
                runTimeout(drainQueue);
            }
        };

        // v8 likes predictible objects
        function Item(fun, array) {
            this.fun = fun;
            this.array = array;
        }
        Item.prototype.run = function() {
            this.fun.apply(null, this.array);
        };
        process.title = 'browser';
        process.browser = true;
        process.env = {};
        process.argv = [];
        process.version = ''; // empty string to avoid regexp issues
        process.versions = {};

        function noop() {}

        process.on = noop;
        process.addListener = noop;
        process.once = noop;
        process.off = noop;
        process.removeListener = noop;
        process.removeAllListeners = noop;
        process.emit = noop;
        process.prependListener = noop;
        process.prependOnceListener = noop;

        process.listeners = function(name) { return [] }

        process.binding = function(name) {
            throw new Error('process.binding is not supported');
        };

        process.cwd = function() { return '/' };
        process.chdir = function(dir) {
            throw new Error('process.chdir is not supported');
        };
        process.umask = function() { return 0; };


        /***/
    }),
    /* 6 */
    /***/
    (function(module, __webpack_exports__, __webpack_require__) {

        "use strict";
        var App = {
            template: `
    <div>我是一个入口组件</div>
  `
        };

        /* harmony default export */
        __webpack_exports__["a"] = (App);

        /***/
    })
    /******/
]);